The dma_alloc_* functions sets the memory to 0 before returning so there
is no need to call memset after the allocation.  Also no point in clearing
the memory when disabling the buffer.
Signed-off-by: NVivek Kutal <vivek.kutal@azingo.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>