(vasnprintf): correct check if realloc returns NULL

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@5774 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/snprintf.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H<>gskolan
+ * Copyright (c) 1995-1997, 1999 Kungliga Tekniska H<>gskolan
  * (Royal Institute of Technology, Stockholm, Sweden).
  * All rights reserved.
  * 
@@ -583,7 +583,7 @@ vasnprintf (char **ret, size_t max_sz, const char *format, va_list args)
     *state.s = '\0';
     len = state.s - state.str;
     tmp = realloc (state.str, len+1);
-    if (state.str == NULL) {
+    if (tmp == NULL) {
       free (state.str);
       *ret = NULL;
       return -1;