ntdll: Checks if a DLL exports any function before allocating space for it

[Julien Otélé Manda]

Hi,
When a dll exports no function, NtAllocateVirtualMemory were called
with a null size  to store its functions anyway, thus returning a
STATUS_INVALID_PARAMETER error which was not handled properly.
The number of function exported is now checked before calling
NtAllocateVirtualMemory.

Changelog :

   * ntdll: Checks if a DLL exports any function before allocating space for it
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