Daniel Axtens 243682baaa io/gzio: Abort early when get_byte() reads nothing
This isn't intended to be a functional change, but it makes a lot of failures a lot
faster, which is extremely helpful for fuzzing.

Without this change, we keep trying and trying to read more bytes into our buffer,
never being able to (read always returns 0) and so we just return old buffer contents
over and over until the decompression process fails some other way.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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This is GRUB 2, the second version of the GRand Unified Bootloader.
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