m68knommu: define __fls

Like fls, but can't be handed 0 and returns the bit number.

(I broke this arch in linux-next by using __fls in generic code).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

arch/m68knommu/include/asm/bitops.h

@@ -331,6 +331,7 @@ found_middle:
 #endif /* __KERNEL__ */
 
 #include <asm-generic/bitops/fls.h>
+#include <asm-generic/bitops/__fls.h>
 #include <asm-generic/bitops/fls64.h>
 
 #endif /* _M68KNOMMU_BITOPS_H */