ASoC: arizona: Fix type of clock rate pointer in arizona_set_sysclk

Both the sysclk and asyncclk members of arizona_priv are signed by we
refer to them through an unsigned pointer. This patch fixes this small
harmless error.
Signed-off-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/arizona.c

@@ -1214,7 +1214,7 @@ int arizona_set_sysclk(struct snd_soc_codec *codec, int clk_id,
 	unsigned int reg;
 	unsigned int mask = ARIZONA_SYSCLK_FREQ_MASK | ARIZONA_SYSCLK_SRC_MASK;
 	unsigned int val = source << ARIZONA_SYSCLK_SRC_SHIFT;
-	unsigned int *clk;
+	int *clk;
 
 	switch (clk_id) {
 	case ARIZONA_CLK_SYSCLK: