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: I4cdae4b9fcf6bd59c8f3ccc6d64a66f7866b7876
Signed-off-by: Suprith Malligere Shankaregowda <supgow@codeaurora.org>