video: exynos_mipi_dsi: Remove unused code

This code is never executed and hence removed.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Acked-by: NInki Dae <inki.dae@samsung.com>
Signed-off-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>

drivers/video/exynos/exynos_mipi_dsi_common.c

@@ -288,9 +288,6 @@ int exynos_mipi_dsi_wr_data(struct mipi_dsim_device *dsim, unsigned int data_id,
 		mutex_unlock(&dsim->lock);
 		return -EINVAL;
 	}
-
-	mutex_unlock(&dsim->lock);
-	return 0;
 }
 
 static unsigned int exynos_mipi_dsi_long_data_rd(struct mipi_dsim_device *dsim,