mpr/tests: Сheck the return values of the WNetGetUniversalNameA.

[Roman Dadkov]

This patch adds additional check for the returned results in the test 
for the function WNetGetUniversalNameA.
The following cases are checked:
1 transmission of an incorrect buffer size
2 transmission of an incorrect buffer pointer
3 transmission path to the file
Similar checks are carried out to call a function with parameter 
REMOTE_NAME_INFO_LEVEL.
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