PVS-Studio warning V547 for Firebird

static bool get_switches(....)
  ....
  if (**argv != 'n' || **argv != 'N')
  {
    fprintf(stderr,
      "-sqlda :  Deprecated Feature: you must use XSQLDA\n ");
    print_switches();
    return false;
  }
  ....
}

This suspicious code was found in Firebird project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression '* * argv != 'n' || * * argv != 'N'' is always true. Probably the '&&' operator should be used here. gpre.cpp 1829

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/