staging: rtl8723bs: os_dep: fix spelling mistake "offet" -> "offset"

There is a spelling mistake in a DBG_871X error message. Fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190916092211.32646-1-colin.king@canonical.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>