staging/lustre/o2iblnd: Fix misspelled attemps->attempts

Highlighted by checkpatch:
WARNING: 'attemps' may be misspelled - perhaps 'attempts'?
#20278: FILE: drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:3272:
+ * reconnection attemps.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>