Squelch a warning.

In at least some versions of GLib, g_array_free() warns if passed a null
pointer, rather than just silently returning.

Change-Id: I1bfc0a81faa1eeebe288f6e0cc58ebfb64784958
Reviewed-on: https://code.wireshark.org/review/3068
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 4 insertions, 2 deletions

diff --git a/file.c b/file.c
index 25d1ec2684..576b9c783c 100644
--- a/file.c
+++ b/file.c
@@ -500,8 +500,10 @@ cf_close(capture_file *cf)
   cf->finfo_selected = NULL;
 
   /* No frame link-layer types, either. */
-  g_array_free(cf->linktypes, TRUE);
-  cf->linktypes = NULL;
+  if (cf->linktypes != NULL) {
+    g_array_free(cf->linktypes, TRUE);
+    cf->linktypes = NULL;
+  }
 
   /* Clear the packet list. */
   packet_list_freeze();