staging: drm/imx: fix spelling error for vsync flag config

partial fix of changes from
"staging: drm/imx: Add support for VGA via TVE on i.MX53"

Have to check for vsync_pin instead of hsync_pin to set Vsync_pol.
Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Rogerio Pimentel <rpimentel.silva@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/imx-drm/ipu-v3/ipu-di.c

@@ -614,11 +614,11 @@ int ipu_di_init_sync_panel(struct ipu_di *di, struct ipu_di_signal_cfg *sig)
 				di_gen |= DI_GEN_POLARITY_7;
 		}
 		if (sig->Vsync_pol) {
-			if (sig->hsync_pin == 3)
+			if (sig->vsync_pin == 3)
 				di_gen |= DI_GEN_POLARITY_3;
-			else if (sig->hsync_pin == 6)
+			else if (sig->vsync_pin == 6)
 				di_gen |= DI_GEN_POLARITY_6;
-			else if (sig->hsync_pin == 8)
+			else if (sig->vsync_pin == 8)
 				di_gen |= DI_GEN_POLARITY_8;
 		}
 	}