USB: emi62.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: Paul Gortmaker <paul.gortmaker@windriver.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>