staging: imx-drm: imx-hdmi: clean up hdmi_phy_wait_i2c_done

Simplify hdmi_phy_wait_i2c_done so the call to hdmi_readb is
only done in one place. Also check for timout before waiting
as suggested by Troy Kisky.
This also fixes a checkpatch warning.
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/imx-drm/imx-hdmi.c

@@ -659,13 +659,10 @@ static inline void hdmi_phy_test_dout(struct imx_hdmi *hdmi,
 
 static bool hdmi_phy_wait_i2c_done(struct imx_hdmi *hdmi, int msec)
 {
-	unsigned char val = 0;
-	val = hdmi_readb(hdmi, HDMI_IH_I2CMPHY_STAT0) & 0x3;
-	while (!val) {
-		udelay(1000);
+	while ((hdmi_readb(hdmi, HDMI_IH_I2CMPHY_STAT0) & 0x3) == 0) {
 		if (msec-- == 0)
 			return false;
-		val = hdmi_readb(hdmi, HDMI_IH_I2CMPHY_STAT0) & 0x3;
+		udelay(1000);
 	}
 	return true;
 }