dplayx: Fix incorrect check in DirectPlayLobbyAImpl_EnumLocalApplications and IDirectPlayLobbyAImpl_EnumAddressTypes.

[Robert Shearman]

Dereferencing a function pointer and checking it against NULL doesn't 
make any sense, so remove the checks.
---
  dlls/dplayx/dplobby.c |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)
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