minixfs: kill manual hweight(), simplify

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index 6415fe0..26bbd55 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -130,7 +130,7 @@
 	if (!size)
 		return 0;
 
-	size = (size >> 4) + ((size & 15) > 0);
+	size >>= 4;
 	while (*p++ == 0xffff) {
 		if (--size == 0)
 			return (p - addr) << 4;