ASoC: max9867: silence and array overflow warning

Smatch complains that we might reach the end of this loop without
finding what we're looking for leading to a buffer overflow.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max9867.c

@@ -156,6 +156,8 @@ static inline int get_ni_value(int mclk, int rate)
 		if (ni_div[i].mclk >= mclk)
 			break;
 	}
+	if (i == ARRAY_SIZE(ni_div))
+		return -EINVAL;
 
 	switch (rate) {
 	case 8000: