ewdrv: exit previously initialized drivers in case of failure
ewdrv: exit previously initialized drivers in case of failure

Change-Id: Ia4ca165d2362b21ee2538b834dd6b0836064e4ce
Tracked-On: https://jira01.devtools.intel.com/browse/OAM-38216
Signed-off-by: Jeremy Compostella <5b4de6d90b3d4185ed5afe686aad4ea88ac71343@intel.com>
Reviewed-on: https://android.intel.com:443/542233

herbert-de-vaucanson/efiwrapper,herbert-de-vaucanson/efiwrapper