util/romcc: Don't read 'member' if it might be NULL

The earlier loop exits gracefully iff i == index. In other cases, member
might be NULL, so check that the scan was successful before using its
results.

Change-Id: I818c233d797d82fa819243c4626dd9c4b7de3ac6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Found-by: Coverity Scan #1129147
Reviewed-on: https://review.coreboot.org/17887
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/util/romcc/romcc.c b/util/romcc/romcc.c
index 7b5e5d7..baf8014 100644
--- a/util/romcc/romcc.c
+++ b/util/romcc/romcc.c
@@ -6406,11 +6406,10 @@
 			i++;
 			member = member->right;
 		}
-		size += reg_needed_padding(state, member, size);
 		if (i != index) {
 			internal_error(state, 0, "Missing member index: %u", index);
 		}
-
+		size += reg_needed_padding(state, member, size);
 	}
 	else if ((type->type & TYPE_MASK) == TYPE_JOIN) {
 		ulong_t i;