parse_config_key(): return subsection len as size_t

We return the length to a subset of a string using an "int *"
out-parameter. This is fine most of the time, as we'd expect config keys
to be relatively short, but it could behave oddly if we had a gigantic
config key. A more appropriate type is size_t.

Let's switch over, which lets our callers use size_t as appropriate
(they are bound by our type because they must pass the out-parameter as
a pointer). This is mostly just a cleanup to make it clear this code
handles long strings correctly. In practice, our config parser already
chokes on long key names (because of a similar int/size_t mixup!).

When doing an int/size_t conversion, we have to be careful that nobody
was trying to assign a negative value to the variable. I manually
confirmed that for each case here. They tend to just feed the result to
xmemdupz() or similar; in a few cases I adjusted the parameter types for
helper functions to make sure the size_t is preserved.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

archive-tar.c

@@ -364,7 +364,7 @@ static struct archiver **tar_filters;
 static int nr_tar_filters;
 static int alloc_tar_filters;
 
-static struct archiver *find_tar_filter(const char *name, int len)
+static struct archiver *find_tar_filter(const char *name, size_t len)
 {
 	int i;
 	for (i = 0; i < nr_tar_filters; i++) {
@@ -380,7 +380,7 @@ static int tar_filter_config(const char *var, const char *value, void *data)
 	struct archiver *ar;
 	const char *name;
 	const char *type;
-	int namelen;
+	size_t namelen;
 
 	if (parse_config_key(var, "tar", &name, &namelen, &type) < 0 || !name)
 		return 0;