gas: ginsn: do not emit an unnecessary trailing comma in textual dump

For ginsns with less than 2 source operands or no destination operands,
the current textual dump contains a superfluous comma, like the relevant
testcases show.

Adjust the code a bit to not emit the lone trailing comma.  Also, adjust
the aarch64 and x86_64 testcases.

gas/
        * ginsn.c (ginsn_src_print): Do not use a trailing comma when
	printing the src of ginsn.
        (ginsn_print): Check the strlen and prefix a comma before the
	src string.

gas/testsuite/
	* gas/scfi/aarch64/ginsn-cofi-1.l: Adjust the expected textual
	dump of the ginsn.
	* gas/scfi/x86_64/ginsn-cofi-1.l: Likewise.

3 files changed, 19 insertions, 13 deletions

diff --git a/gas/ginsn.c b/gas/ginsn.c
index 20e83c5..08c8e5a 100644
--- a/gas/ginsn.c
+++ b/gas/ginsn.c
@@ -477,14 +477,14 @@ ginsn_src_print (struct ginsn_src *src)
   switch (src->type)
     {
     case GINSN_SRC_REG:
-      snprintf (src_str, len, "%%r%d, ", ginsn_get_src_reg (src));
+      snprintf (src_str, len, "%%r%d", ginsn_get_src_reg (src));
       break;
     case GINSN_SRC_IMM:
-      snprintf (src_str, len, "%lld, ",
+      snprintf (src_str, len, "%lld",
 		(long long int) ginsn_get_src_imm (src));
       break;
     case GINSN_SRC_INDIRECT:
-      snprintf (src_str, len, "[%%r%d+%lld], ", ginsn_get_src_reg (src),
+      snprintf (src_str, len, "[%%r%d+%lld]", ginsn_get_src_reg (src),
 		(long long int) ginsn_get_src_disp (src));
       break;
     default:
@@ -578,16 +578,22 @@ ginsn_print (ginsnS *ginsn)
   /* src 2.  */
   src = ginsn_get_src2 (ginsn);
   src_buf = ginsn_src_print (src);
-  str_size += snprintf (ginsn_str + str_size, GINSN_LISTING_LEN - str_size,
-			"%s", src_buf);
+  if (strlen (src_buf))
+    {
+      str_size += snprintf (ginsn_str + str_size, GINSN_LISTING_LEN - str_size,
+			    ", %s", src_buf);
+    }
   free (src_buf);
   gas_assert (str_size >= 0 && str_size < GINSN_LISTING_LEN);
 
   /* dst.  */
   dst = ginsn_get_dst (ginsn);
   char *dst_buf = ginsn_dst_print (dst);
-  str_size += snprintf (ginsn_str + str_size, GINSN_LISTING_LEN - str_size,
-			"%s", dst_buf);
+  if (strlen (dst_buf))
+    {
+      str_size += snprintf (ginsn_str + str_size, GINSN_LISTING_LEN - str_size,
+			    ", %s", dst_buf);
+    }
   free (dst_buf);
 
 end:
diff --git a/gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l b/gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l
index d05e19d..168547c 100644
--- a/gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l
+++ b/gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l
@@ -19,7 +19,7 @@ AARCH64 GAS  .*
   11 \?\?\?\? 02000014 		b       .L3
   11              	ginsn: JMP 
   12 \?\?\?\? 20021FD6 		br      x17
-  12              	ginsn: JMP %r17, 
+  12              	ginsn: JMP %r17
   13              	.L3:
   13              	ginsn: SYM .L3
   14 \?\?\?\? 60003FD6 		blr     x3
diff --git a/gas/testsuite/gas/scfi/x86_64/ginsn-cofi-1.l b/gas/testsuite/gas/scfi/x86_64/ginsn-cofi-1.l
index 3261b76..fdb2dcb 100644
--- a/gas/testsuite/gas/scfi/x86_64/ginsn-cofi-1.l
+++ b/gas/testsuite/gas/scfi/x86_64/ginsn-cofi-1.l
@@ -18,7 +18,7 @@ GAS LISTING .*
   11 \?\?\?\? E200     		loop    foo
   11              	ginsn: JCC 
   12 \?\?\?\? 3EFFE0   		notrack jmp     \*%rax
-  12              	ginsn: JMP %r0, 
+  12              	ginsn: JMP %r0
   13 \?\?\?\? 41FFD0   		call    \*%r8
   13              	ginsn: CALL
   14 \?\?\?\? FF14C500 		call    \*cost_arr\(,%rax,8\)
@@ -33,15 +33,15 @@ GAS LISTING .*
   17 \?\?\?\? 67E316   		jecxz   .L179
   17              	ginsn: JCC 
   18 \?\?\?\? 41FFE0   		jmp     \*%r8
-  18              	ginsn: JMP %r8, 
+  18              	ginsn: JMP %r8
   19 \?\?\?\? FF6730   		jmp     \*48\(%rdi\)
-  19              	ginsn: JMP %r5, 
+  19              	ginsn: JMP %r5
   20 \?\?\?\? FF24C500 		jmp     \*cost_arr\(,%rax,8\)
   20      000000
-  20              	ginsn: JMP %r0, 
+  20              	ginsn: JMP %r0
   21 \?\?\?\? FF242500 		jmp     \*symbol\+1
   21      000000
-  21              	ginsn: JMP %r4, 
+  21              	ginsn: JMP %r4
   22 \?\?\?\? 7000     		jo      .L179
   22              	ginsn: JCC 
   23              	.L179: