[mythtv] [patch] epg program record type selection fix

[avalanche at beyondmonkey.com]

Finally got around to tracking this pesky little one down. If you 
select/change the recording type for a program from the epg 
(via infodialog) it would sometimes segfault or if you're really 
lucky, change programs left or right of the actual selected program.

Long story short, infodialog was using an unstable pointer passed 
from the epg.

av

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