[C++] s390: Fix enum gdb_syscall conversion

Fixes:

 src/gdb/s390-linux-tdep.c: In function ‘gdb_syscall s390_canonicalize_syscall(int, s390_abi_kind)’:
 src/gdb/s390-linux-tdep.c:2622:16: error: invalid conversion from ‘int’ to ‘gdb_syscall’ [-fpermissive]
	  return syscall;
		 ^
 src/gdb/s390-linux-tdep.c:2722:16: error: invalid conversion from ‘int’ to ‘gdb_syscall’ [-fpermissive]
	  return syscall;
		 ^
 src/gdb/s390-linux-tdep.c:2725:24: error: invalid conversion from ‘int’ to ‘gdb_syscall’ [-fpermissive]
	  return syscall + 2;
			 ^
 src/gdb/s390-linux-tdep.c:2728:24: error: invalid conversion from ‘int’ to ‘gdb_syscall’ [-fpermissive]
	  return syscall + 5;
			 ^
 src/gdb/s390-linux-tdep.c:2731:24: error: invalid conversion from ‘int’ to ‘gdb_syscall’ [-fpermissive]
	  return syscall + 6;
			 ^
 src/gdb/s390-linux-tdep.c:2734:24: error: invalid conversion from ‘int’ to ‘gdb_syscall’ [-fpermissive]
	  return syscall + 7;
			 ^

gdb/ChangeLog:
2015-11-19  Simon Marchi  <simon.marchi@ericsson.com>
	    Pedro Alves  <palves@redhat.com>

	* s390-linux-tdep.c (s390_canonicalize_syscall): Add casts and
	intermediate 'int' variable.

1 files changed, 24 insertions, 17 deletions

diff --git a/gdb/s390-linux-tdep.c b/gdb/s390-linux-tdep.c
index 3ce6336..0f8a3a8 100644
--- a/gdb/s390-linux-tdep.c
+++ b/gdb/s390-linux-tdep.c
@@ -2619,7 +2619,7 @@ s390_canonicalize_syscall (int syscall, enum s390_abi_kind abi)
     case 197: /* fstat64 */
     case 221: /* fcntl64 */
       if (abi == ABI_LINUX_S390)
-        return syscall;
+        return (enum gdb_syscall) syscall;
       return gdb_sys_no_syscall;
     /* These syscalls don't exist on s390.  */
     case 17: /* break */
@@ -2717,22 +2717,29 @@ s390_canonicalize_syscall (int syscall, enum s390_abi_kind abi)
       return gdb_sys_newfstatat;
     /* 313+ not yet supported */
     default:
-      /* Most "old" syscalls copied from i386.  */
-      if (syscall <= 221)
-        return syscall;
-      /* xattr syscalls.  */
-      if (syscall >= 224 && syscall <= 235)
-        return syscall + 2;
-      /* timer syscalls.  */
-      if (syscall >= 254 && syscall <= 262)
-        return syscall + 5;
-      /* mq_* and kexec_load */
-      if (syscall >= 271 && syscall <= 277)
-        return syscall + 6;
-      /* ioprio_set .. epoll_pwait */
-      if (syscall >= 282 && syscall <= 312)
-        return syscall + 7;
-      return gdb_sys_no_syscall;
+      {
+	int ret;
+
+	/* Most "old" syscalls copied from i386.  */
+	if (syscall <= 221)
+	  ret = syscall;
+	/* xattr syscalls.  */
+	else if (syscall >= 224 && syscall <= 235)
+	  ret = syscall + 2;
+	/* timer syscalls.  */
+	else if (syscall >= 254 && syscall <= 262)
+	  ret = syscall + 5;
+	/* mq_* and kexec_load */
+	else if (syscall >= 271 && syscall <= 277)
+	  ret = syscall + 6;
+	/* ioprio_set .. epoll_pwait */
+	else if (syscall >= 282 && syscall <= 312)
+	  ret = syscall + 7;
+	else
+	  ret = gdb_sys_no_syscall;
+
+	return (enum gdb_syscall) ret;
+      }
     }
 }