Fix possible threading issue in a spec
Fix possible threading issue in a spec

The previous code is wrong in that t1 is not guaranteed to have
exited.  t2 is required to still be alive, though.  So just
join the thread instead of checking that it is dead.

gferguson-gd/sequel,yazshel/sequel,offshore-safety/sequel,seeARMS/sequel,nicohvi/sequel,yazshel/sequel,dennis-d/custom_sequel,pfarrell/sequel,beni55/sequel,freshpay/sequel,offshore-safety/sequel,mpalmer/sequel,t-morgan/sequel,bigfix/sequel,freshpay/sequel,davidbegin/sequel,seeARMS/sequel,pfarrell/sequel,uhoh-itsmaciek/sequel,nju520/sequel,gferguson-gd/sequel,beni55/sequel,reubano/sequel,uhoh-itsmaciek/sequel,reubano/sequel,mpalmer/sequel,davidbegin/sequel,nicohvi/sequel,knut2/sequel,knut2/sequel,offshore-safety/sequel,nju520/sequel,chef/sequel,dennis-d/custom_sequel,Marketcircle/sequel,t-morgan/sequel