net: ipv6: Amend ipv6_recv_error usage
Usage of ipv6_recv_error, included in commit f704820, needs to be
updated to account for the changes in ad25b5d.

Fixes:
  net/ipv6/ping.c: In function 'pingv6_init':
  net/ipv6/ping.c:84:29: warning: assignment from incompatible pointer type [enabled by default]

Change-Id: Ia77db6e465072fb794999a20f75f59e848a88b79
Signed-off-by: Luis Cruz <ljc2491@gmail.com>
Fixes to patch 3.4.88 on the Sony subsystem