EmulatorPkg/EmuSimpleFileSystemDxe: Fix minor typos

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15614 6f19259b-4bc3-4df7-8a09-765794883524
EmulatorPkg/EmuSimpleFileSystemDxe: Fix incorrect return values upon allocation failure

In EmuSimpleFileSystemOpenVolume() function - in case an allocation failed
with AllocatePool() - EFI_UNSUPPORTED was being returned instead of
EFI_OUT_OF_RESOURCES, which is incorrect.

Even worse, in EmuSimpleFileSystemDriverBindingStart(), an unitiliasied
variable (Status) will be returned in case of an allocation failure with
AllocateZeroPool().

This patch fixes both issues by correctly returning EFI_OUT_OF_RESOURCES.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15615 6f19259b-4bc3-4df7-8a09-765794883524