vz: don't close a negative fd
vz: don't close a negative fd

CID 131298 (#1 of 1): Argument cannot be negative (NEGATIVE_RETURNS)
9. negative_returns: wait_sock is passed to a parameter that cannot be negative.

xemul/libct,avagin/libct,xemul/libct,xemul/libct,xemul/libct,avagin/libct,avagin/libct