help.c: remove common category behavior from drop_prefix() behavior

Change the behavior of the "git" prefix stripping for CAT_guide so
that we don't try to strip the "git-" prefix in that case. We should
be stripping either "git" or "git-" depending on the category. This
change makes it easier to add extra "category" conditions in
subsequent commits.

Before this we'd in principle strip a "git-" prefix from a "guide" in
command-list.txt, in practice we have no such entry there. As we don't
have any entry that looks like "git-foo" in command-list.txt this
changes nothing in practice, but it makes the intent of the code
clearer. In that hypothetical case we'd now strip it down to "-foo",
not "foo".

When this code was added in cfb22a02ab (help: use command-list.h for
common command list, 2018-05-10) the only entries in command-list.txt
that didn't begin with "git-" were "gitweb" and "gitk".

Then when the "guides" special-case was added in 1b81d8cb19 (help:
use command-list.txt for the source of guides, 2018-05-20) we had the
various "git" (not "git-") prefixed "guide" entries, which the
"CAT_guide" case handles.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

help.c

@@ -44,16 +44,17 @@ static struct category_description main_categories[] = {
 static const char *drop_prefix(const char *name, uint32_t category)
 {
 	const char *new_name;
-	const char *prefix = NULL;
+	const char *prefix;
 
-	if (skip_prefix(name, "git-", &new_name))
-		return new_name;
 	switch (category) {
 	case CAT_guide:
 		prefix = "git";
 		break;
+	default:
+		prefix = "git-";
+		break;
 	}
-	if (prefix && skip_prefix(name, prefix, &new_name))
+	if (skip_prefix(name, prefix, &new_name))
 		return new_name;
 
 	return name;