bus: mhi: ep: Fix off by one in mhi_ep_process_cmd_ring()

The > comparison should be changed to >= to prevent an out of bounds
access into the mhi_cntrl->mhi_chan[] array.  The mhi_cntrl->mhi_chan[]
array is allocated in mhi_ep_chan_init() and has mhi_cntrl->max_chan
elements.

Fixes: 6de4941c ("bus: mhi: ep: Check if the channel is supported by the controller")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/Y9JH5sudiZWvbODv@kili


Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>