I've attached a small patch that unifies the three calls to grep_commandline_arg in grep.c's main:
I've also pushed an even less substantial patch to alphabetize some enum names, here: http://git.savannah.gnu.org/cgit/grep.git/commit/?id=f240c9477c7d76b74dbbc9390c727d49d3c7bc88
0001-maint-unify-three-argv-processing-calls.patch
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