PVS-Studio warning V590 for FCEUX

bool Set_RS_Val()
{
  ...
  int appliedSize = rs_type_size;
  int appliedSign = rs_t;
  if(rs_c == 'n')
    appliedSize = 'w', appliedSign = 'u';
  if(rs_c == 'a')
    appliedSize = 'd', appliedSign = 'u';
  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 FCEUX project by PVS-Studio static code analyzer.
Warning message is:
V590 Consider inspecting the 'appliedSize == 'b' && appliedSize != 's'' expression. The expression is excessive or contains a misprint. fceux ram_search.cpp 877

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