drm/omap: fix wrong variable type

'r' is supposed to be int, not u16, so fix it.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/hdmi_pll.c

@@ -102,7 +102,7 @@ static int hdmi_pll_enable(struct dss_pll *dsspll)
 {
 	struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
 	struct hdmi_wp_data *wp = pll->wp;
-	u16 r = 0;
+	int r;
 
 	dss_ctrl_pll_enable(DSS_PLL_HDMI, true);