[gdb/testsuite] Fix dw2-ranges-psym.exp with -readnow

When running test-case gdb.dwarf2/dw2-ranges-psym.exp with target board
-readnow, I run into:
...
(gdb) file dw2-ranges-psym^M
Reading symbols from dw2-ranges-psym...^M
Expanding full symbols from dw2-ranges-psym...^M
(gdb) set complaints 0^M
(gdb) FAIL: gdb.dwarf2/dw2-ranges-psym.exp: No complaints
...

The problem is that the regexp expects a gdb prompt immediately after the
"Reading symbols" line.

Fix this by updating the regexp.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2021-08-22  Tom de Vries  <tdevries@suse.de>

	* lib/gdb.exp (gdb_load_no_complaints): Update regexp to allow
	"Expanding full symbols" Line.

1 files changed, 5 insertions, 1 deletions

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 2f95989..0933927 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -5328,7 +5328,11 @@ proc gdb_load_no_complaints { arg } {
     }
 
     # Verify that there were no complaints.
-    set re "^Reading symbols from \[^\r\n\]*\r\n$gdb_prompt $"
+    set re \
+	[multi_line \
+	     "^Reading symbols from \[^\r\n\]*" \
+	     "(Expanding full symbols from \[^\r\n\]*" \
+	     ")?$gdb_prompt $"]
     gdb_assert {[regexp $re $gdb_file_cmd_msg]} "No complaints"
 }