[gdb/testsuite] Use gdb_gcore_cmd in gdb.threads/gcore-thread.exp

I noticed a plain gcore command in test-case gdb.threads/gcore-thread.exp:
...
    gdb_test "gcore $core0file" "Saved corefile .*" \
      "save a zeroed-threads corefile"
...

Use gdb_gcore_cmd instead.

Tested on x86_64-linux.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.threads/gcore-thread.exp b/gdb/testsuite/gdb.threads/gcore-thread.exp
index 748831e..4a77fd6 100644
--- a/gdb/testsuite/gdb.threads/gcore-thread.exp
+++ b/gdb/testsuite/gdb.threads/gcore-thread.exp
@@ -106,7 +106,7 @@ foreach symbol {__stack_user stack_used} {
 }
 
 if {"$core0file" != ""} {
-    gdb_test "gcore $core0file" "Saved corefile .*" "save a zeroed-threads corefile"
+    gdb_gcore_cmd $core0file "save a zeroed-threads corefile"
 }