msm: ais: Fix out-of-bounds read in string class name

jpeg driver is calling class_create with stack variable, which
can be overwritten by other stack variables.

Change-Id: I92ccd4629cef8a06b7715b8483cf53a9607bd22f
Signed-off-by: Deepak Shankar <dees@codeaurora.org>
Signed-off-by: Rahul Sharma <rahsha@codeaurora.org>