NextBSD/src de409e3usr.bin/printenv printenv.c

Chase a cornercase in printenv and sync its behaviour with builtin's

The cornercase is when printenv is passed a parameter in the form VAR=val,
where VAR=val exists in the environment. In this case, printenv would print a
spurious newline and returns 0.

Approved by:            cognet
MFC after:                      1 week
DeltaFile
+2-2usr.bin/printenv/printenv.c
+2-21 files

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