K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2019-03-01T01:20:21.834353Z
K 7
svn:log
V 509
patch(1): Exit successfully if we're fed a 0-length patch

This change is made in the name of GNU patch compatibility. If GNU patch is
fed a zero-length patch, it will exit successfully with no output. This is
used in at least one port to date (comms/wsjtx), and we break on this usage.

It seems unlikely that anyone relies on patch(1) calling their completely
empty patch garbage and failing, and GNU compatibility is a plus if it helps
with porting, so make the switch.

Reported by:	db
MFC after:	2 weeks

END