msm: IPA: remove the redundent if-else check

We will send IPA_QMI_ERR_INCOMPATIBLE_STATE_V01 no matter why mhi failure.
The redundent if-else check is not needed in this case.
When 5G ssr happens, mhi APIs may return error in multiple cases and
the chan_alloc / vote QMI request from Q6 will fail. It is safe to just
simply ignore the error to avoid stability issue in 5g ssr case.

Change-Id: I4c08956c8fa2ce77bc45bb82f9faef205caa2646
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>