msm: ADSPRPC: Fix return value when dsp capabilities 
is not supported

Use new variable to find is dsp capability support
was successful.
Fix regression issue of 3657372.

Change-Id: Idb427f53ed8f23a0c2a60852457f7721f1ebca87
Signed-off-by: vgattupa <vgattupa@codeaurora.org>
1 file changed