[Mutt] #2919: never used local variable in crypt_gpgme.c

[Mutt <fleas@xxxxxxxx>]

#2919: never used local variable in crypt_gpgme.c

 In file crypt_gpgme.c in function get_micalg the variable bp is never
 used. This causes a compiler warning.

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Ticket URL: <http://dev.mutt.org/trac/ticket/2919>