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libefivar expects opening /dev/efi to indicate if the we can make efi runtime calls. With a null routine, it was always succeeding leading efi_variables_supported() to return the wrong value. Only succeed if we have an efi_runtime table. Also, while I'm hear, out of an abundance of caution, add a likely redundant check to make sure efi_systbl is not NULL before dereferencing it. I know it can't be NULL if efi_cfgtbl is non-NULL, but the compiler doesn't. |
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