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This adds a break to the case statement for the
audproc TX volume ioctl. Without this fix an
erroneous error print for invlid ioctl will be
printed when the audproc TX volume ioctl is used.

Change-Id: Ide75cc58af255664369dd313d26d6afc1f2e9987
Signed-off-by: Ben Romberger <bromberg@codeaurora.org>