PVS-Studio warning V547 for DeSmuME

bool Set_RS_Val()
{
  ...
  if((appliedSize == 'b' && appliedSize == 's' &&
      (rs_param < -128 || rs_param > 127)) ||
     (appliedSize == 'b' && appliedSize != 's' &&
      (rs_param < 0 || rs_param > 255)) ||
     (appliedSize == 'w' && appliedSize == 's' &&
      (rs_param < -32768 || rs_param > 32767)) ||
     (appliedSize == 'w' && appliedSize != 's' &&
      (rs_param < 0 || rs_param > 65535)))
    return false;
  ...
}

This suspicious code was found in DeSmuME project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression 'appliedSize == 'b' && appliedSize == 's'' is always false. Probably the '||' operator should be used here. DeSmuME_VS2005 ram_search.cpp 817

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