This commit fixes the unbalanced clock handling, where
a failed probe would leave the clock with an enable count of -1.
Reported-by: NJosh Cartwright <joshc@ni.com>
Signed-off-by: NMoritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>