help.c::exclude_cmds(): plug a leak
help.c::exclude_cmds(): plug a leak

Command name removed from the list of commands via the exclusion
were overwritten and lost without being freed.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git