ASoC: sdm670: fix clock refcount for MI2S shutdown

For MI2S shutdown, if clock disable is failed,
do not bother to re-increment clock reference. Otherwise,
next time when startup is called, clock enable will not
be called again, so use case will not work.

CRs-Fixed: 2166356
Change-Id: Ic7a93a5f20eaabed93d0cd94d76d09f0f1c869fd
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>