1/ Error handling code following a kzalloc should free the allocated data.
2/ Report an error when no platform data is detected

Both problems fixed by moving the platform data check before the allocation,
and allows a goto to be killed.
Reported-by: NJulia Lawall <julia@diku.dk>
Acked-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

This supported all DMA channels, and it was tested in SH7722,
SH7780, SH7785 and SH7763.
This can not use with SH DMA API.
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Reviewed-by: NMatt Fleming <matt@console-pimps.org>
Acked-by: NMaciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: NPaul Mundt <lethal@linux-sh.org>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>