util/romcc: free variable after use

closure_type is copied then never used again. Close that leak.

Change-Id: Idd4201f7fc6495fde5ad2e1feb7e499e38986e92
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Found-by: Coverity Scan #1287073
Reviewed-on: https://review.coreboot.org/18015
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

util/romcc/romcc.c

@@ -14376,6 +14376,8 @@ static void expand_function_call(
 
 	/* Update the called functions closure variable */
 	closure_idx = add_closure_type(state, func, closure_type);
+	free(closure_type);
+	closure_type = NULL;
 
 	/* Generate some needed triples */
 	ret_loc = label(state);