Fix multiline strip_comments logic

The strip_comments function uses the count of quotes to know if a
comment char (';' or '#') is the start of a comment or part of the
multiline as a string.
Unfortunately converting the count of quotes from previous lines to a
boolean meant that it would only work as expected in some cases
(0 quotes or an odd number of quotes).

src/config_parse.c

@@ -351,7 +351,7 @@ static int parse_multiline_variable(git_config_parser *reader, git_buf *value, i
 		}
 
 		/* If it was just a comment, pretend it didn't exist */
-		quote_count = strip_comments(line, !!in_quotes);
+		quote_count = strip_comments(line, in_quotes);
 		if (line[0] == '\0')
 			goto next;