[RTEMS Project] #4301: grcan.c: Unused value error spotted by Coverity

[RTEMS trac]

#4301: grcan.c: Unused value error spotted by Coverity
------------------------+--------------------
  Reporter:  Ryan Long  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  normal     |  Milestone:  6.1
 Component:  bsps       |    Version:  6
  Severity:  normal     |   Keywords:
Blocked By:             |   Blocking:
------------------------+--------------------
 CID 1437613: Unused value in grcan_set_sfilter().

 {{{
 1788                /* disable TX/RX SYNC filtering */
     CID 1437613 (#1 of 1): Unused value (UNUSED_VALUE)assigned_value:
 Assigning value 4294967295ULL to pDev->sfilter.mask here, but that stored
 value is overwritten before it can be used.
 1789                pDev->sfilter.mask = 0xffffffff;
     value_overwrite: Overwriting previous write to pDev->sfilter.mask with
 value 0ULL.
 1790                pDev->sfilter.mask = 0;
 }}}

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Ticket URL: <http://devel.rtems.org/ticket/4301>
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