no need to call ai_close() if ai_dump_block() failed (again)
no need to call ai_close() if ai_dump_block() failed (again)

if ai_dump_block() returns NULL, this means that either ai has
been invalid all along, or that ai_dump_block() has freed it already.
in any case, there is no use to call ai_close() again.

CID:22446

umlaeute/ambix,umlaeute/ambix,kronihias/libambix,iem-projects/ambix,umlaeute/ambix,iem-projects/ambix,kronihias/libambix,iem-projects/ambix