rpcrt4: Don't call VirtualFree with MEM_RELEASE and non-zero size.

[Rob Shearman]

The calls fail with ERROR_INVALID_PARAMETER. Instead just call with a
zero size which performs the intended function.
---
 dlls/rpcrt4/cstub.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)
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