msm: kgsl: Make sure that a valid context exists before profiling
msm: kgsl: Make sure that a valid context exists before profiling

Don't enable the profiling IBs if a valid context isn't passed
to adreno_ringbuffer_addcmds.

CRs-fixed: 522827
Change-Id: Ic0dedbad504e3dee05de0a0a2f19d47c1b7f8b2a
Signed-off-by: Jordan Crouse <fec53db8c4887e6e95defbb5052bc6438029c1e6@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas