pcmcia: Fix ide-cs sparse warning

Sparse shows the following warning:

  CHECK   drivers/ide/legacy/ide-cs.c
drivers/ide/legacy/ide-cs.c:378:6: warning: symbol 'ide_release' was
not declared. Should it be static?

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
CC: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>