wineps.drv: Retrieve the full printer name to avoid truncation when the name is 32 characters or longer.

Since we return success, we should at least make sure the result is not
uninitialized memory.

d3dx9_36: Rename variables in D3DXGetShaderConstantTable(Ex) to match naming convention used in the file.

kernel32: Abstract the key creation routine and move the key existence check to the top-level function.