bsdsocket: break the loop if socket argument is invalid
bsdsocket: break the loop if socket argument is invalid

If socket is not a proper acceptable socket (-1, for example), break the
server accept loop, to avoid CPU hog.

condor-the-bird/tarantool,nvoron23/tarantool,ocelot-inc/tarantool,dkorolev/tarantool,nvoron23/tarantool,dkorolev/tarantool,nvoron23/tarantool,Sannis/tarantool,Sannis/tarantool,dkorolev/tarantool,ocelot-inc/tarantool,condor-the-bird/tarantool,guard163/tarantool,KlonD90/tarantool,guard163/tarantool,rtsisyk/tarantool,dkorolev/tarantool,nvoron23/tarantool,condor-the-bird/tarantool,nvoron23/tarantool,guard163/tarantool,KlonD90/tarantool,nvoron23/tarantool,KlonD90/tarantool,Sannis/tarantool,condor-the-bird/tarantool,vasilenkomike/tarantool,rtsisyk/tarantool,Sannis/tarantool,mejedi/tarantool,Sannis/tarantool,guard163/tarantool,vasilenkomike/tarantool,guard163/tarantool,rtsisyk/tarantool,vasilenkomike/tarantool,vasilenkomike/tarantool,KlonD90/tarantool,ocelot-inc/tarantool,mejedi/tarantool,mejedi/tarantool,KlonD90/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,condor-the-bird/tarantool,dkorolev/tarantool,mejedi/tarantool,vasilenkomike/tarantool