i2c: i2c-msm-geni: Return correct error code if registration fail

Captures return value while registring i2c adapter to the bus, if fails
then return the same value and print the error code.

Change-Id: I6ff5b5a2bf4436ba076807fe2bdd11635a65d367
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>