bc: shorten bc_program_addFunc()

function                                             old     new   delta
bc_func_init                                           -      50     +50
bc_program_addFunc                                   201     138     -63
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(add/remove: 1/0 grow/shrink: 0/1 up/down: 50/-63)            Total: -13 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed