msm: Camera: Return proper value for msm_camera_qup_i2c_txdata().

msm_camera_qup_i2c_txdata() is not returning proper value.
Due to which session tear down is not happening properly
in case of i2c failure.

CRs-Fixed: 640328
Change-Id: I25cfa10302aeab020ba1710adeed5b860fb7cb3b
Signed-off-by: Vivek Veenam <vveenam@codeaurora.org>