drm/amdgpu: Avoid integer overflow in amdgpu_device_suspend_display_audio

When building with Clang:

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:4160:53: warning: overflow in
expression; result is -294967296 with type 'long' [-Winteger-overflow]
                expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4L;
                                                                  ^
1 warning generated.

Multiplication happens first due to order of operations and both
NSEC_PER_SEC and 4 are long literals so the expression overflows. To
avoid this, make 4 an unsigned long long literal, which matches the
type of expires (u64).

Fixes: 3f12acc8 ("drm/amdgpu: put the audio codec into suspend state before gpu reset V3")
Link: https://github.com/ClangBuiltLinux/linux/issues/1017Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -4157,7 +4157,7 @@ static int amdgpu_device_suspend_display_audio(struct amdgpu_device *adev)
 		 * the audio controller default autosuspend delay setting.
 		 * 4S used here is guaranteed to cover that.
 		 */
-		expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4L;
+		expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4ULL;
 
 	while (!pm_runtime_status_suspended(&(p->dev))) {
 		if (!pm_runtime_suspend(&(p->dev)))