[src/6model/multi_dispatch.c] fix gcc 'parentheses around && within ||' warning
[src/6model/multi_dispatch.c] fix gcc 'parentheses around && within ||' warning

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp