MFC	r280307: bsdgrep: fix regression in the -f option since r268799
MFC	r280307:
bsdgrep: fix regression in the -f option since r268799

Caused by an incomplete merge from NetBSD.

PR:		198725

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase