simplify/fix recursive maildir listing

there is no need to call maildir_list_{path,inbox}() from
maildir_list_recurse(), as maildir_list_store() will do that anyway -
if it's actually requested, that is. this means that this removes the
implicit listing when Inbox is nested into Path, or vice versa. this is
actually correct, as the Patterns matching would throw away the non-
requested boxes anyway.

src/drv_maildir.c

@@ -363,9 +363,6 @@ maildir_list_maildirpp( maildir_store_t *ctx, int flags, const char *inbox )
 	return 0;
 }
 
-static int maildir_list_inbox( maildir_store_t *ctx, int flags, const char *basePath );
-static int maildir_list_path( maildir_store_t *ctx, int flags, const char *inbox );
-
 static int
 maildir_list_recurse( maildir_store_t *ctx, int isBox, int flags,
                       const char *inbox, uint inboxLen, const char *basePath, uint basePathLen,
@@ -405,16 +402,8 @@ maildir_list_recurse( maildir_store_t *ctx, int isBox, int flags,
 		pl += pathLen;
 		if (inbox && equals( path, pl, inbox, inboxLen )) {
 			// Inbox nested into Path.
-			if (maildir_list_inbox( ctx, flags, NULL ) < 0) {
-				closedir( dir );
-				return -1;
-			}
 		} else if (basePath && equals( path, pl, basePath, basePathLen )) {
 			// Path nested into Inbox.
-			if (maildir_list_path( ctx, flags, NULL ) < 0) {
-				closedir( dir );
-				return -1;
-			}
 		} else {
 			if (style == SUB_LEGACY) {
 				if (*ent == '.') {
@@ -453,7 +442,7 @@ maildir_list_recurse( maildir_store_t *ctx, int isBox, int flags,
 }
 
 static int
-maildir_list_inbox( maildir_store_t *ctx, int flags, const char *basePath )
+maildir_list_inbox( maildir_store_t *ctx, int flags )
 {
 	char path[_POSIX_PATH_MAX], name[_POSIX_PATH_MAX];
 
@@ -462,6 +451,7 @@ maildir_list_inbox( maildir_store_t *ctx, int flags, const char *basePath )
 	ctx->listed |= LIST_INBOX;
 
 	add_string_list( &ctx->boxes, "INBOX" );
+	const char *basePath = ctx->conf->path;
 	return maildir_list_recurse(
 	        ctx, 1, flags, NULL, 0, basePath, basePath ? strlen( basePath ) - 1 : 0,
 	        path, nfsnprintf( path, _POSIX_PATH_MAX, "%s/", ctx->conf->inbox ),
@@ -469,7 +459,7 @@ maildir_list_inbox( maildir_store_t *ctx, int flags, const char *basePath )
 }
 
 static int
-maildir_list_path( maildir_store_t *ctx, int flags, const char *inbox )
+maildir_list_path( maildir_store_t *ctx, int flags )
 {
 	char path[_POSIX_PATH_MAX], name[_POSIX_PATH_MAX];
 
@@ -479,8 +469,9 @@ maildir_list_path( maildir_store_t *ctx, int flags, const char *inbox )
 
 	if (maildir_ensure_path( ctx->conf ) < 0)
 		return -1;
+	const char *inbox = ctx->conf->inbox;
 	return maildir_list_recurse(
-	        ctx, 0, flags, inbox, inbox ? strlen( inbox ) : 0, NULL, 0,
+	        ctx, 0, flags, inbox, strlen( inbox ), NULL, 0,
 	        path, nfsnprintf( path, _POSIX_PATH_MAX, "%s", ctx->conf->path ),
 	        name, 0 );
 }
@@ -495,9 +486,9 @@ maildir_list_store( store_t *gctx, int flags,
 	if (conf->sub_style == SUB_MAILDIRPP
 	        ? maildir_list_maildirpp( ctx, flags, conf->inbox ) < 0
 	        : ((((flags & LIST_PATH) || ((flags & LIST_PATH_MAYBE) && conf->path))
-	            && maildir_list_path( ctx, flags, conf->inbox ) < 0) ||
+	            && maildir_list_path( ctx, flags ) < 0) ||
 	           ((flags & LIST_INBOX)
-	            && maildir_list_inbox( ctx, flags, conf->path ) < 0))) {
+	            && maildir_list_inbox( ctx, flags ) < 0))) {
 		maildir_invoke_bad_callback( ctx );
 		cb( DRV_CANCELED, NULL, aux );
 	} else {