[media] max2165: get rid of warning: no previous prototype

drivers/media/tuners/max2165.c:164:5: warning: no previous prototype for 'fixpt_div32' [-Wmissing-prototypes]
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/tuners/max2165.c

@@ -161,7 +161,7 @@ static int max2165_set_bandwidth(struct max2165_priv *priv, u32 bw)
 	return 0;
 }
 
-int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction)
+static int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction)
 {
 	u32 remainder;
 	u32 q, f = 0;