bitops: simplify get_count_order_long()

These two cases could be unified into one.
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lkml.kernel.org/r/20200807085837.11697-2-richard.weiyang@linux.alibaba.comSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/bitops.h

@@ -206,10 +206,7 @@ static inline int get_count_order_long(unsigned long l)
 {
 	if (l == 0UL)
 		return -1;
-	else if (l & (l - 1UL))
-		return (int)fls_long(l);
-	else
-		return (int)fls_long(l) - 1;
+	return (int)fls_long(--l);
 }
 
 /**