drm/amd/display: fix typos in several function pointer checks

Fix several copypaste mistakes in *_disable_link_output() functions where
an improper function pointer is checked before dereference.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Signed-off-by: Vitaliy Shevtsov <v.shevtsov@maxima.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c

@@ -3315,7 +3315,7 @@ void dce110_disable_link_output(struct dc_link *link,
 	 * from enable/disable link output and only call edp panel control
 	 * in enable_link_dp and disable_link_dp once.
 	 */
-	if (dmcu != NULL && dmcu->funcs->lock_phy)
+	if (dmcu != NULL && dmcu->funcs->unlock_phy)
 		dmcu->funcs->unlock_phy(dmcu);
 	dc->link_srv->dp_trace_source_sequence(link, DPCD_SOURCE_SEQ_AFTER_DISABLE_LINK_PHY);
 }

drivers/gpu/drm/amd/display/dc/hwss/dcn314/dcn314_hwseq.c

@@ -478,7 +478,7 @@ void dcn314_disable_link_output(struct dc_link *link,
 	 * from enable/disable link output and only call edp panel control
 	 * in enable_link_dp and disable_link_dp once.
 	 */
-	if (dmcu != NULL && dmcu->funcs->lock_phy)
+	if (dmcu != NULL && dmcu->funcs->unlock_phy)
 		dmcu->funcs->unlock_phy(dmcu);
 	dc->link_srv->dp_trace_source_sequence(link, DPCD_SOURCE_SEQ_AFTER_DISABLE_LINK_PHY);
 

drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c

@@ -1398,10 +1398,10 @@ void dcn32_disable_link_output(struct dc_link *link,
 	link->phy_state.symclk_state = SYMCLK_OFF_TX_OFF;
 
 	if (signal == SIGNAL_TYPE_EDP &&
-			link->dc->hwss.edp_backlight_control &&
+			link->dc->hwss.edp_power_control &&
 			!link->skip_implict_edp_power_control)
 		link->dc->hwss.edp_power_control(link, false);
-	else if (dmcu != NULL && dmcu->funcs->lock_phy)
+	else if (dmcu != NULL && dmcu->funcs->unlock_phy)
 		dmcu->funcs->unlock_phy(dmcu);
 
 	dc->link_srv->dp_trace_source_sequence(link, DPCD_SOURCE_SEQ_AFTER_DISABLE_LINK_PHY);