[pushed 1/3] [gdb/testsuite] Handle non-existing testfile in find_core_file

[Tom de Vries <tdevries@suse.de>]

Proc find_core_file assumes that variable testfile exists.

The variable doesn't exist when not using standard_testfile.

Fix this by checking if it exists in find_core_file.
---
 gdb/testsuite/lib/gdb.exp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index a77063b0bf0..dca32750fbf 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -10303,7 +10303,9 @@ proc find_core_file {pid} {
     } elseif {$pid != -1} {
 	lappend files core.$pid
     }
-    lappend files ${::testfile}.core
+    if {[info exists ::testfile]} {
+	lappend files ${::testfile}.core
+    }
     lappend files core
 
     foreach file $files {
-- 
2.51.0