As reported by Coverity, we did not free dirnode in the case of failure.
Do so now.
Change-Id: I6af93d24c33302d8911ff0021d1c1b067d2a2715
Reported-by: Coverity (CID: 131221)
Cc: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit fa9ca8a5d271e0533f61222df2bd6fd512687dbd)