staging: sm750fb: Replace multiple spaces with tabs when it suits

Replace multiple spaces before some comments with one tab. Aligning the
comment with the function below it.
Signed-off-by: Gabriela Bittencourt <gabrielabittencourt00@gmail.com>
Link: https://lore.kernel.org/r/20191029232207.4113-3-gabrielabittencourt00@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/sm750_accel.c

@@ -243,21 +243,21 @@ int sm750_hw_copyarea(struct lynx_accel *accel,
 	 */
 	write_dpr(accel, DE_WINDOW_DESTINATION_BASE, dBase); /* dpr44 */
 
-    /*
-     * Program pitch (distance between the 1st points of two adjacent lines).
-     * Note that input pitch is BYTE value, but the 2D Pitch register uses
-     * pixel values. Need Byte to pixel conversion.
-     */
+	/*
+	 * Program pitch (distance between the 1st points of two adjacent lines).
+	 * Note that input pitch is BYTE value, but the 2D Pitch register uses
+	 * pixel values. Need Byte to pixel conversion.
+	 */
 	write_dpr(accel, DE_PITCH,
 		  ((dPitch / Bpp << DE_PITCH_DESTINATION_SHIFT) &
 		   DE_PITCH_DESTINATION_MASK) |
 		  (sPitch / Bpp & DE_PITCH_SOURCE_MASK)); /* dpr10 */
 
-    /*
-     * Screen Window width in Pixels.
-     * 2D engine uses this value to calculate the linear address in frame buffer
-     * for a given point.
-     */
+	/*
+	 * Screen Window width in Pixels.
+	 * 2D engine uses this value to calculate the linear address in frame buffer
+	 * for a given point.
+	 */
 	write_dpr(accel, DE_WINDOW_WIDTH,
 		  ((dPitch / Bpp << DE_WINDOW_WIDTH_DST_SHIFT) &
 		   DE_WINDOW_WIDTH_DST_MASK) |