drm/radeon/kms: fix DP detect

only return connected if there is actually a
monitor connected.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index e1cbd50..75977a4 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -440,7 +440,7 @@
 					 dig_connector->dp_i2c_bus->rec.i2c_id, 0);
 }
 
-void radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
+bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector)
 {
 	struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
 	u8 msg[25];
@@ -456,10 +456,10 @@
 				printk("%02x ", msg[i]);
 			printk("\n");
 		}
-		return;
+		return true;
 	}
 	dig_connector->dpcd[0] = 0;
-	return;
+	return false;
 }
 
 void radeon_dp_set_link_config(struct drm_connector *connector,