[gdb/testsuite] Use string_to_regexp on core filename in gdb_core_cmd

In commit 1281424ccf "[gdb/testsuite] Fix core file load FAIL in
tls-core.exp", I've made this change:
...
-       -re ": No such file or directory.*\r\n$gdb_prompt $" {
+       -re "$core: No such file or directory.*\r\n$gdb_prompt $" {
...

However, the $core variable contains a filename which needs to be matched
as a literal string, not as a regexp.

Fix this by using string_to_regexp.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-03-12  Tom de Vries  <tdevries@suse.de>

	* lib/gdb.exp (gdb_core_cmd): Use string_to_regexp for regexp-matching
	$core.

2 files changed, 6 insertions, 1 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 3d829b0..77b3695 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,10 @@
 2020-03-12  Tom de Vries  <tdevries@suse.de>
 
+	* lib/gdb.exp (gdb_core_cmd): Use string_to_regexp for regexp-matching
+	$core.
+
+2020-03-12  Tom de Vries  <tdevries@suse.de>
+
 	* lib/gdb.exp (gdb_core_cmd): Make "No such file or directory" regexp
 	more precise.
 
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index bb70ef1..ae2d810 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -4648,7 +4648,7 @@ proc gdb_core_cmd { core test } {
 	    fail "$test (bad file format)"
 	    return -1
 	}
-	-re "$core: No such file or directory.*\r\n$gdb_prompt $" {
+	-re -wrap "[string_to_regexp $core]: No such file or directory.*" {
 	    fail "$test (file not found)"
 	    return -1
 	}