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Join conditions in warn_helper()

--- a/cc1/error.c

+++ b/cc1/error.c

@@ -17,16 +17,18 @@

 {

 	if (flag == 0)

 		return;

-	if (flag < 0)

-		failure = 1;

 	fprintf(stderr, "%s:%u: %s: ",

 	       input->fname, input->nline,

 	       (flag < 0) ? "error" : "warning");

 	vfprintf(stderr, fmt, va);

 	putc('\n', stderr);

-	if (flag < 0 && nerrors++ == MAXERRNUM) {

-		fputs("too many errors\n", stderr);

-		exit(1);

+

+	if (flag < 0) {

+		failure = 1;

+		if (nerrors++ == MAXERRNUM) {

+			fputs("too many errors\n", stderr);

+			exit(1);

+		}

 	}

 }