libmutt: fix memory code for degenerate cases

diff --git a/mutt/memory.c b/mutt/memory.c
index 71f3559e8afd22b170524605821f72f08c5a6c94..cf89090880e0b925eff33d941021ba377fa0c3ec 100644 (file)
--- a/mutt/memory.c
+++ b/mutt/memory.c
@@ -120,6 +120,9 @@ void *mutt_mem_malloc(size_t size)
  */
 void mutt_mem_realloc(void *ptr, size_t size)
 {
+  if (!ptr)
+    return;
+
   void **p = (void **) ptr;
 
   if (size == 0)