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[cc1] Simplify comment()

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -166,18 +166,14 @@

 	c = -1;

 repeat:

 	do {

-		if (!c)

-			goto unterminated;

-	} while (!eof && (c = readchar()) != type);

+		if (!c || eof) {

+			errorp("unterminated comment");

+			return;

+		}

+	} while ((c = readchar()) != type);

-	if (eof)

-		goto unterminated;

 	if (type == '*' && (c = readchar()) != '/')

 		goto repeat;

-	return;

-

-unterminated:

-	errorp("unterminated comment");

 }

 static int