Remove repeated nr_open assignment

The nr_open variable is already initialized to NR_OPEN_DEF.  This patch
removes the redundant checking and assignment for nr_open.

Initialy submited by  Salman Ahmed <salman0yam@gmail.com> However, I
could not get any of his patches appled.

Signed-off-by: Alexandra Yates <alexandra.yates@linux.intel.com>