[NDR] Fix Overflow Check

[Robert Shearman]

ChangeLog:
Fix the overflow check to not depend on pStubMsg->BufferStart and
pStubMsg->BufferEnd being valid, because they aren't filled in when
using MIDL-generated server stubs.

Don't set the pointer to NULL on unmarshaling because we may want to
unmarshal the value to an existing pointer instead of allocating a new one.

   dlls/rpcrt4/ndr_marshall.c |    7 +++----
   1 files changed, 3 insertions(+), 4 deletions(-)


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