msm: bam_dmux: Add error checking for debugfs nodes

Add error checking to prevent silent failures for
debugfs support.

Change-Id: I245935fa76e79fdb24313f9ba010209e56b74cd0
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
1 file changed