FIX: Use the return code from which correctly
authorJoel Uckelman <uckelman@nomic.net>
Fri, 6 Aug 2021 20:34:01 +0000 (21:34 +0100)
committerRafael dos Santos Silva <xfalcox@gmail.com>
Fri, 6 Aug 2021 20:49:22 +0000 (17:49 -0300)
commitf568633bf060c18cc0866b4018842ce9ec9da33a
treec05fe32b71b0fdb6217d4ceff06fa5a66fbd402d
parente5419c34bbb9bba88e2ce8302f574aa6f8c5c746
FIX: Use the return code from which correctly

The return code of which is the number of arguments which failed...
but what we actually want is 0 when at least one of the docker
exectutables is found and nonzero when none are found.
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