drm/i915/gvt: Fix one indent error

Fix below warning:

drivers/gpu/drm/i915//gvt/handlers.c:323 gdrst_mmio_write() warn: inconsistent indenting
Reviewed-by: NZhi Wang <zhi.a.wang@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/handlers.c

@@ -322,7 +322,7 @@ static int gdrst_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 	intel_gvt_reset_vgpu_locked(vgpu, false, engine_mask);
 
 	/* sw will wait for the device to ack the reset request */
-	 vgpu_vreg(vgpu, offset) = 0;
+	vgpu_vreg(vgpu, offset) = 0;
 
 	return 0;
 }