[qarsh] Remove continue which could make qarsh hang

I don't know how, but I found one instance of qarsh looping
through the pselect loop with a one second timeout.  If the command has
exited and the output file descriptors are all closed, we fall onto
this continue which prevents us from getting to the break at the end of
the loop.  The only thing the continue skips over is that check which we
really should check, so remove the continue.

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