make maildir_list_recurse() recursion less convoluted

move the unconditional addition of INBOX out ouf the function.
this makes it possible to move the folder check and addition to the
listing before the recursion, which seems clearer.

src/drv_maildir.c

@@ -243,15 +243,6 @@ maildir_list_recurse( store_t *gctx, int isBox, int flags,
 	struct dirent *de;
 	struct stat st;
 
-	if (isBox) {
-		path[pathLen++] = '/';
-		if (isBox > 1 ||
-		    (nfsnprintf( path + pathLen, _POSIX_PATH_MAX - pathLen, "cur" ),
-		     !stat( path, &st ) && S_ISDIR(st.st_mode)))
-			add_string_list( &gctx->boxes, name );
-		path[pathLen] = 0;
-		name[nameLen++] = '/';
-	}
 	if (!(dir = opendir( path ))) {
 		if (isBox && (errno == ENOENT || errno == ENOTDIR))
 			return 0;
@@ -290,6 +281,12 @@ maildir_list_recurse( store_t *gctx, int isBox, int flags,
 				}
 			}
 			nl = nameLen + nfsnprintf( name + nameLen, _POSIX_PATH_MAX - nameLen, "%s", ent );
+			path[pl++] = '/';
+			nfsnprintf( path + pl, _POSIX_PATH_MAX - pl, "cur" );
+			if (!stat( path, &st ) && S_ISDIR(st.st_mode))
+				add_string_list( &gctx->boxes, name );
+			path[pl] = 0;
+			name[nl++] = '/';
 			if (maildir_list_recurse( gctx, 1, flags, inbox, inboxLen, basePath, basePathLen, path, pl, name, nl ) < 0) {
 				closedir( dir );
 				return -1;
@@ -305,10 +302,11 @@ maildir_list_inbox( store_t *gctx, int flags, const char *basePath )
 {
 	char path[_POSIX_PATH_MAX], name[_POSIX_PATH_MAX];
 
+	add_string_list( &gctx->boxes, "INBOX" );
 	return maildir_list_recurse(
-	        gctx, 2, flags, 0, 0, basePath, basePath ? strlen( basePath ) - 1 : 0,
-	        path, nfsnprintf( path, _POSIX_PATH_MAX, "%s", ((maildir_store_conf_t *)gctx->conf)->inbox ),
-	        name, nfsnprintf( name, _POSIX_PATH_MAX, "INBOX" ) );
+	        gctx, 1, flags, 0, 0, basePath, basePath ? strlen( basePath ) - 1 : 0,
+	        path, nfsnprintf( path, _POSIX_PATH_MAX, "%s/", ((maildir_store_conf_t *)gctx->conf)->inbox ),
+	        name, nfsnprintf( name, _POSIX_PATH_MAX, "INBOX/" ) );
 }
 
 static int