Since we (Analog Devices) updated our Blackfin kernel to 2.6.28, we've
seen occasional 5-second hangs from telnet.  telnetd calls select with a
NULL timeout, but with the new kernel, the system call occasionally
returns 0, which causes telnet to call sleep (5).  This did not happen
with earlier kernels.

The code in sys_pselect7 looks a bit strange, in particular the variable
"to" is initialized to NULL, then changed if a non-null timeout was
passed in, but not used further.  The patch below passes it to
core_sys_select instead of &end_time, and this appears to fix the
problem.  Does this look like the correct approach?

Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
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