apply.c: split check_whitespace() into two

This splits the logic to record the presence of whitespace errors out of
the check_whitespace() function, which checks and then records.  The new
function, record_ws_error(), can be used by the blank-at-eof check that
does not use ws_check() logic to report its findings in the same output
format.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin-apply.c

@@ -1055,23 +1055,29 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
 	return -1;
 }
 
-static void check_whitespace(const char *line, int len, unsigned ws_rule)
+static void record_ws_error(unsigned result, const char *line, int len, int linenr)
 {
 	char *err;
-	unsigned result = ws_check(line + 1, len - 1, ws_rule);
+
 	if (!result)
 		return;
 
 	whitespace_error++;
 	if (squelch_whitespace_errors &&
 	    squelch_whitespace_errors < whitespace_error)
-		;
-	else {
-		err = whitespace_error_string(result);
-		fprintf(stderr, "%s:%d: %s.\n%.*s\n",
-			patch_input_file, linenr, err, len - 2, line + 1);
-		free(err);
-	}
+		return;
+
+	err = whitespace_error_string(result);
+	fprintf(stderr, "%s:%d: %s.\n%.*s\n",
+		patch_input_file, linenr, err, len, line);
+	free(err);
+}
+
+static void check_whitespace(const char *line, int len, unsigned ws_rule)
+{
+	unsigned result = ws_check(line + 1, len - 1, ws_rule);
+
+	record_ws_error(result, line + 1, len - 2, linenr);
 }
 
 /*