[gdb/testsuite] Update regexp in gdb.debuginfod/fetch_src_and_symbols.exp

Since commit 7b80401da00 ("Handle DWARF 5 separate debug sections"), test-case
gdb.debuginfod/fetch_src_and_symbols.exp fails here:
...
(gdb) file fetch_src_and_symbols_alt.o^M
Reading symbols from fetch_src_and_symbols_alt.o...^M
warning: could not find supplementary DWARF file \
  (fetch_src_and_symbols_dwz.o) for fetch_src_and_symbols_alt.o^M
(gdb) FAIL: $exp: no_url: file fetch_src_and_symbols_alt.o
...
because this is expected:
...
(gdb) file fetch_src_and_symbols_alt.o^M
Reading symbols from fetch_src_and_symbols_alt.o...^M
warning: could not find '.gnu_debugaltlink' file for \
  fetch_src_and_symbols_alt.o^M
(gdb) PASS: $exp: no_url: file fetch_src_and_symbols_alt.o
...

Fix this by updating the regexp.

Tested on x86_64-linux.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp b/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp
index 7b36f65..4b3894e 100644
--- a/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp
+++ b/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp
@@ -152,7 +152,7 @@ proc_with_prefix no_url { } {
     # Test that GDB cannot find dwz without debuginfod.
     clean_restart
     gdb_test "file ${binfile}_alt.o" \
-	".*could not find '.gnu_debugaltlink'.*" \
+	".*could not find supplementary DWARF file .*" \
 	"file [file tail ${binfile}_alt.o]"
 
     # Generate a core file and test that GDB cannot find the