signals: kill sigfindinword()

It has no users and it doesn't look useful. I do not know why/when it was
introduced, I can't even find any user in the git history.

Signed-off-by: Oleg Nesterov <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Al Viro <[e-mail]>
Cc: David Woodhouse <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Mathieu Desnoyers <[e-mail]>
Cc: Richard Weinberger <[e-mail]>
Cc: Steven Rostedt <[e-mail]>
Cc: Tejun Heo <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/m68k/include/asm/signal.h

···
 	 __const_sigismember(set,sig) :		\
 	 __gen_sigismember(set,sig))
 
-static inline int sigfindinword(unsigned long word)
-{
-	asm ("bfffo %1{#0,#0},%0"
-		: "=d" (word)
-		: "d" (word & -word)
-		: "cc");
-	return word ^ 31;
-}
-
 #endif /* !CONFIG_CPU_HAS_NO_BITFIELDS */
 
 #ifndef __uClinux__

arch/x86/include/asm/signal.h

···
 	 ? __const_sigismember((set), (sig))	\
 	 : __gen_sigismember((set), (sig)))
 
-static inline int sigfindinword(unsigned long word)
-{
-	asm("bsfl %1,%0" : "=r"(word) : "rm"(word) : "cc");
-	return word;
-}
-
 struct pt_regs;
 
 #else /* __i386__ */

include/linux/signal.h

···
 		return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
 }
 
-static inline int sigfindinword(unsigned long word)
-{
-	return ffz(~word);
-}
-
 #endif /* __HAVE_ARCH_SIG_BITOPS */
 
 static inline int sigisemptyset(sigset_t *set)