x86/efi: Fix dummy variable buffer allocation
1. Check for allocation failure 2. Clear the buffer contents, as they may actually be written to flash 3. Don't leak the buffer Compile-tested only. [ Tested successfully on my buggy ASUS machine - Matt ] Signed-off-by: NBen Hutchings <ben@decadent.org.uk> Cc: stable@vger.kernel.org Signed-off-by: NMatt Fleming <matt.fleming@intel.com>
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