efi_loader: LoadImage() check source size

If the size of the source buffer is 0, return EFI_LOAD_ERROR.
(UEFI SCT II 2017: 3.4.1 LoadImage() - 5.1.4.1.6)

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
1 file changed