msm: ais: handle the error value returned during get clock

currently only NULL pointer check is used to validate the return
value from clk_get, this change to handle all the failures.
This snapshot is taken from auto-kernel.lnx.4.4.c1
ported it from auto-kernel.lnx.4.4.c1 to 4.4

Change-Id: I275cb4717c675baf528e05c50058f2c6b0025011
Signed-off-by: E V Ravi <evenka@codeaurora.org>