RChangeServiceConfig*() miss some parameter checks

While working on CORE-14521, I noticed the following points. I guess they need fixing...

See (MsDN) ChangeServiceConfig2A function.

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https://git.reactos.org/?p=reactos.git;a=blob;f=base/system/services/rpcserver.c;hb=bcec1fd6c37677d46d6890d270bb1e27d17f8f34

• RChangeServiceConfigA() misses some parameter checks.
  For example, see RChangeServiceConfigW(), which has /* Check for invalid service type value */.
  • Not sure whether checks should be copied or RChangeServiceConfigA() rewritten to call RChangeServiceConfigW()...
• RChangeServiceConfig2W() misses a check to reject invalid Info.dwInfoLevel values.
  See ChangeServiceConfig2W().
  • It currently defaults to ERROR_SUCCESS, which looks wrong in this case.
• RChangeServiceConfig2A() "misses" a check to reject invalid Info.dwInfoLevel values.
  See ChangeServiceConfig2A().
  • It currently calls RChangeServiceConfig2W() with a partly uninitialized InfoW, which is acceptable with current code.