drm/radeon: remove three set but not used variable

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/radeon/radeon_atombios.c: In function
‘radeon_get_atom_connector_info_from_object_table’:
drivers/gpu/drm/radeon/radeon_atombios.c:651:26: warning: variable
‘grph_obj_num’ set but not used [-Wunused-but-set-variable]
drivers/gpu/drm/radeon/radeon_atombios.c:651:13: warning: variable
‘grph_obj_id’ set but not used [-Wunused-but-set-variable]
drivers/gpu/drm/radeon/radeon_atombios.c:573:37: warning: variable
‘con_obj_type’ set but not used [-Wunused-but-set-variable]

They are never used, and so can be removed.
Signed-off-by: yu kuai <yukuai3@huawei.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -570,7 +570,7 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 		path_size += le16_to_cpu(path->usSize);
 
 		if (device_support & le16_to_cpu(path->usDeviceTag)) {
-			uint8_t con_obj_id, con_obj_num, con_obj_type;
+			uint8_t con_obj_id, con_obj_num;
 
 			con_obj_id =
 			    (le16_to_cpu(path->usConnObjectId) & OBJECT_ID_MASK)
@@ -578,9 +578,6 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 			con_obj_num =
 			    (le16_to_cpu(path->usConnObjectId) & ENUM_ID_MASK)
 			    >> ENUM_ID_SHIFT;
-			con_obj_type =
-			    (le16_to_cpu(path->usConnObjectId) &
-			     OBJECT_TYPE_MASK) >> OBJECT_TYPE_SHIFT;
 
 			/* TODO CV support */
 			if (le16_to_cpu(path->usDeviceTag) ==
@@ -648,15 +645,7 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
 			router.ddc_valid = false;
 			router.cd_valid = false;
 			for (j = 0; j < ((le16_to_cpu(path->usSize) - 8) / 2); j++) {
-				uint8_t grph_obj_id, grph_obj_num, grph_obj_type;
-
-				grph_obj_id =
-				    (le16_to_cpu(path->usGraphicObjIds[j]) &
-				     OBJECT_ID_MASK) >> OBJECT_ID_SHIFT;
-				grph_obj_num =
-				    (le16_to_cpu(path->usGraphicObjIds[j]) &
-				     ENUM_ID_MASK) >> ENUM_ID_SHIFT;
-				grph_obj_type =
+				uint8_t grph_obj_type =
 				    (le16_to_cpu(path->usGraphicObjIds[j]) &
 				     OBJECT_TYPE_MASK) >> OBJECT_TYPE_SHIFT;