The clk_round_rate() and clk_set_rate() will return int, so not store thier
return value to unsigned long variable.  This bug hides real error on these
API.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>