msm: mhl: sii8334: initialize return value

Initialize the variable holding the return code
to appropriate error value so that an incorrect
return code isn't sent to the caller.

Change-Id: I7654523c37ac9b7a60dda1fae77dfacc196df6fa
CRs-Fixed: 524484
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>