translate: Fix typo in is_legal_int_format_combo.

Fixes same on both sides defect reported by Coverity.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: José Fonseca <jfonseca@vmware.com>

src/gallium/auxiliary/translate/translate_generic.c

@@ -773,7 +773,7 @@ is_legal_int_format_combo( const struct util_format_description *src,
 
    for (i = 0; i < nr; i++) {
       /* The signs must match. */
-      if (src->channel[i].type != src->channel[i].type) {
+      if (src->channel[i].type != dst->channel[i].type) {
          return FALSE;
       }