msm: vidc: Supress silly error message

The driver printed out an error message as part of ENUM_FMTS when the
userspace passed in an invalid index.  Given that clients typically
enumerate formats by going through every index until one fails, this
error printed out once every session.  As the error isn't particularly
significant, suppress the message entirely.

Change-Id: I2e57bb5d5c9b0d94394f9abd2072d3a06a39edad
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>