tail: Do not trust st_size if it equals zero#20
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sys/arch/m68k/m68k/mmu_subr.s: revision 1.4 m68k: Fix invalid instruction word. PMOVE <ea>,TTn instruction doesn't support (An)+ addressing mode on 68030.
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tail(1) is not able to operate on files residing in pseudo-filesystems or others that advertise a zero size.
To reproduce:
tail -1 /proc/mountsdumps the whole file.Also fixed on FreeBSD: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276107