Change sending/receiving/storing of the rdev value for special files.
Since the value is not needed, protocol 31 no longer sends it, while older protocols are optimized so the sender just sends a valid rdev value as efficiently as possible. The receiver no longer caches an rdev value for special files, and the generator will always pass a 0 rdev value to do_mknod() for special files. Fixes bug #6280.
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