Handle the case of resize to 0 and realloc that returns NULL.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@20561 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/asn1/gen_seq.c

@@ -111,7 +111,7 @@ generate_type_seq (const Symbol *s)
 	     "\t\tsizeof(data->val[0]) * data->len);\n"
 	     /* resize but don't care about failures since it doesn't matter */
 	     "ptr = realloc(data->val, data->len * sizeof(data->val[0]));\n"
-	     "if (ptr) data->val = ptr;\n"
+	     "if (ptr != NULL || data->len == 0) data->val = ptr;\n"
 	     "return 0;\n",
 	     subname);