drm/amd/display: Fix a typo when computing dsc configuration

[why]
Remove a backslash symbol accidentally left in increase bpp function
when computing mst dsc configuration.
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Zhan Liu <zhan.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

@@ -632,7 +632,7 @@ static void increase_dsc_bpp(struct drm_atomic_state *state,
 			if (drm_dp_atomic_find_vcpi_slots(state,
 							  params[next_index].port->mgr,
 							  params[next_index].port,
-							  vars[next_index].pbn,\
+							  vars[next_index].pbn,
 							  dm_mst_get_pbn_divider(dc_link)) < 0)
 				return;
 			if (!drm_dp_mst_atomic_check(state)) {