sched/debug: Explicitly cast sched_feat() to bool

[ Upstream commit 7e6f4c5d600c1c8e2a1d900e65cab319d9b6782e ]

LLVM has a warning that tags expressions like:

	if (foo && non-bool-const)

This pattern triggers for CONFIG_SCHED_DEBUG=n where sched_feat() ends
up being whatever bit we select. Avoid the warning with an explicit
cast to bool.
Reported-by: NPhilipp Klocke <philipp97kl@gmail.com>
Tested-by: NNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>

kernel/sched/sched.h

@@ -1389,7 +1389,7 @@ static const_debug __maybe_unused unsigned int sysctl_sched_features =
 	0;
 #undef SCHED_FEAT
 
-#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
+#define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
 
 #endif /* SCHED_DEBUG && CONFIG_JUMP_LABEL */