USB: host: whci: remove redundant variable t

Variable t is assigned but never read, it is redundant and therefore
can be removed. Cleans up clang warning:

drivers/usb/host/whci/asl.c:106:3: warning: Value stored to 't' is
never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>