Use the appropriate error function for displaying the error,

instead of printing it to stdout.

MFC after:	1 week

usr.bin/indent/lexi.c

@@ -370,7 +370,7 @@ lexi(void)
 	do {			/* copy the string */
 	    while (1) {		/* move one character or [/<char>]<char> */
 		if (*buf_ptr == '\n') {
-		    printf("%d: Unterminated literal\n", line_no);
+		    diag2(1, "Unterminated literal");
 		    goto stop_lit;
 		}
 		CHECK_SIZE_TOKEN;	/* Only have to do this once in this loop,