UBI: fix MAINTAINERS

Fix UBI git tree URL.
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>

MAINTAINERS

@@ -2393,7 +2393,7 @@ P:	Artem Bityutskiy
 M:	dedekind@infradead.org
 W:	http://www.linux-mtd.infradead.org/
 L:	linux-mtd@lists.infradead.org
-T:	git git://git.infradead.org/ubi-2.6.git
+T:	git git://git.infradead.org/~dedekind/ubi-2.6.git
 S:	Maintained
 
 MICROTEK X6 SCANNER