HSI: omap_ssi_core: Fix error handling in ssi_init()

HSI: omap_ssi_core: Fix error handling in ssi_init()

[ Upstream commit 640456108b80123ce73e7d0188da58005409a8ca ]

The ssi_init() returns the platform_driver_register() directly without
checking its return value, if platform_driver_register() failed, the
ssi_pdriver is not unregistered.
Fix by unregister ssi_pdriver when the last platform_driver_register()
failed.

Fixes: 2af0b5ba0aa4 ("HSI: omap_ssi: built omap_ssi and omap_ssi_port into one module")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>