media: s5p-mfc: Optimisation of code to remove error message

Already error number provision is present for block failing, while
requesting for DMA consistent memory allocation.
So removing error message line from the block as recommended
by scripts/checkpatch.pl.

Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>