Sync with diff/diffreg.c r1.75:
authorray <ray@openbsd.org>
Thu, 15 Jul 2010 11:10:23 +0000 (11:10 +0000)
committerray <ray@openbsd.org>
Thu, 15 Jul 2010 11:10:23 +0000 (11:10 +0000)
commit09523d6f279bf59a03f25320dd3bfcfc3972e297
tree406f3a5b8825b157fb64f010774103c026694945
parentafb7c493511835aa93f502eab79ca225ac179e7b
Sync with diff/diffreg.c r1.75:
Return -1 on error as advertised.
Handle case when only one stream failed.

OK xsa, stsp
usr.bin/cvs/diff_internals.c
usr.bin/rcs/diff.c