staging: tidspbridge: fix kernel oops in bridge_io_get_proc_load
The DSP shared memory area gets initialized only when
a COFF file is loaded.
If bridge_io_get_proc_load is called before loading a base
image into the DSP, the shared_mem member of the io manager
will be NULL, resulting in a kernel oops when it's dereferenced.
Also made some coding style changes to bridge_io_create.
Signed-off-by: Ionut Nicu <ionut.nicu@mindbit.ro> Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>