USB: hdpvr-core.c: remove err() usage

err() was a very old USB-specific macro that I thought had
gone away.  This patch removes it from being used in the
driver and uses dev_err() instead.

CC: Mauro Carvalho Chehab <mchehab@infradead.org>
CC: Jarod Wilson <jarod@redhat.com>
CC: Taylor Ralph <tralph@mythtv.org>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>