tables/eit.c: fix wrong check
tables/eit.c: fix wrong check

The test on line 348 was wrong. It should test for p->p_next to exist instead
of testing for it being NULL.

garbear/libdvbpsi,mwgoldsmith/dvbpsi,krieger-od/libdvbpsi,mkrufky/libdvbpsi,avble/libdvbpsi,avble/libdvbpsi,avble/libdvbpsi,krieger-od/libdvbpsi,garbear/libdvbpsi,hiroshiyui/libdvbpsi,vlc-mirror/libdvbpsi,vlc-mirror/libdvbpsi,UIKit0/libdvbpsi,paraeco/libdvbpsi,UIKit0/libdvbpsi,mwgoldsmith/dvbpsi,garbear/libdvbpsi,hiroshiyui/libdvbpsi,mkrufky/libdvbpsi,mwgoldsmith/dvbpsi,mwgoldsmith/dvbpsi,paraeco/libdvbpsi,hiroshiyui/libdvbpsi,vlc-mirror/libdvbpsi,paraeco/libdvbpsi,mkrufky/libdvbpsi,UIKit0/libdvbpsi,krieger-od/libdvbpsi,paraeco/libdvbpsi