Avoid 'malloc' corner case.

* src/init.c (_gpgrt_realloc): Avoid calling 'malloc(0)'.
--
Previously, if '_gpgrt_realloc' was called with both A and N being
zero, malloc is invoked with a size of zero.  This happens e.g. when
calling '_gpgrt_free' with a NULL pointer, which is supposed to be a
no-op.

Found using the Clang Static Analyzer.

Signed-off-by: Justus Winter <justus@g10code.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/init.c b/src/init.c
index e84b234..7abb6ff 100644
--- a/src/init.c
+++ b/src/init.c
@@ -171,15 +171,15 @@ _gpgrt_realloc (void *a, size_t n)
   if (custom_realloc)
     return custom_realloc (a, n);
 
-  if (!a)
-    return malloc (n);
-
   if (!n)
     {
       free (a);
       return NULL;
     }
 
+  if (!a)
+    return malloc (n);
+
   return realloc (a, n);
 }