apply.c::find_name_traditional(): do not initialize len to the line's length

The variable len is set to

    len = strchrnul(line, '\n') - line;

unconditionally 9 lines later, hence we can remove the call to strlen.
Signed-off-by: NStefan Beller <stefanbeller@googlemail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/apply.c

@@ -722,7 +722,7 @@ static char *find_name(const char *line, char *def, int p_value, int terminate)
 
 static char *find_name_traditional(const char *line, char *def, int p_value)
 {
-	size_t len = strlen(line);
+	size_t len;
 	size_t date_len;
 
 	if (*line == '"') {