winex11: Fix memory leak on realloc failure in import_xdnd_selection (cppcheck).

dlls/winex11.drv/clipboard.c

@@ -1285,7 +1285,7 @@ struct format_entry *import_xdnd_selection( Display *display, Window win, Atom s
     UINT i;
     void *data;
     struct clipboard_format *format;
-    struct format_entry *ret = NULL, *entry;
+    struct format_entry *ret = NULL, *tmp, *entry;
     BOOL have_hdrop = FALSE;
 
     register_x11_formats( targets, count );
@@ -1310,7 +1310,8 @@ struct format_entry *import_xdnd_selection( Display *display, Window win, Atom s
         entry_size = (FIELD_OFFSET( struct format_entry, data[size] ) + 7) & ~7;
         if (buf_size < size + entry_size)
         {
-            if (!(ret = realloc( ret, *ret_size + entry_size + 1024 ))) continue;
+            if (!(tmp = realloc( ret, *ret_size + entry_size + 1024 ))) continue;
+            ret = tmp;
             buf_size = *ret_size + entry_size + 1024; /* extra space for following entries */
         }
         entry = (struct format_entry *)((char *)ret + *ret_size);