drm/amdgpu: Fix memory leak in amdgpu_cs_pass1

When p->gang_size equals 0, amdgpu_cs_pass1() will return directly
without freeing chunk_array, which will cause a memory leak issue,
this patch fixes it.

Fixes: 4624459c ("drm/amdgpu: add gang submit frontend v6")
Reviewed-by: NLuben Tuikov <luben.tuikov@amd.com>
Signed-off-by: NDong Chenchen <dongchenchen2@huawei.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -287,8 +287,10 @@ static int amdgpu_cs_pass1(struct amdgpu_cs_parser *p,
 		}
 	}
 
-	if (!p->gang_size)
-		return -EINVAL;
+	if (!p->gang_size) {
+		ret = -EINVAL;
+		goto free_partial_kdata;
+	}
 
 	for (i = 0; i < p->gang_size; ++i) {
 		ret = amdgpu_job_alloc(p->adev, num_ibs[i], &p->jobs[i], vm);