drm/amdgpu: removed duplicate line

Remove duplicate break.
Signed-off-by: John Clements <john.clements@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -1334,7 +1334,6 @@ static int gfx_v9_0_init_microcode(struct amdgpu_device *adev)
 		else
 			chip_name = "raven";
 		break;
-		break;
 	case CHIP_ARCTURUS:
 		chip_name = "arcturus";
 		break;