Correct error status to EFI_NOT_FOUND when the image can't be got.
Correct error status to EFI_NOT_FOUND when the image can't be got.

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@9502 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2