drm/gem-dma: revert the 8-byte alignment constraint

Using drm_mode_size_dumb() to compute the size of dumb buffers introduced
an 8-byte alignment constraint on the pitch that wasn’t present before.
Let’s remove this constraint, which isn’t necessarily required and may
cause buffers to be allocated larger than needed.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: dcacfcd ("drm/gem-dma: Compute dumb-buffer sizes with drm_mode_size_dumb()")
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20251126-lcd_pitch_alignment-v1-1-991610a1e369@microchip.com

Author: ldesroches

drivers/gpu/drm/drm_gem_dma_helper.c

@@ -308,7 +308,7 @@ int drm_gem_dma_dumb_create(struct drm_file *file_priv,
 	struct drm_gem_dma_object *dma_obj;
 	int ret;
 
-	ret = drm_mode_size_dumb(drm, args, SZ_8, 0);
+	ret = drm_mode_size_dumb(drm, args, 0, 0);
 	if (ret)
 		return ret;