Update link count handling in fuse for post-ino64.

Set FUSE_LINK_MAX to UINT32_MAX instead of LINK_MAX to match the maximum
link count possible in the 'nlink' field of 'struct fuse_attr'.

Sponsored by:	Chelsio Communications

sys/fs/fuse/fuse_param.h

@@ -77,6 +77,6 @@
 
 #endif
 
-#define FUSE_LINK_MAX                      LINK_MAX
+#define FUSE_LINK_MAX                      UINT32_MAX
 
 #endif /* _FUSE_PARAM_H_ */

sys/fs/fuse/fuse_vnops.c

@@ -1188,7 +1188,7 @@ fuse_vnop_pathconf(struct vop_pathconf_args *ap)
 		*ap->a_retval = NAME_MAX;
 		return (0);
 	case _PC_LINK_MAX:
-		*ap->a_retval = FUSE_LINK_MAX;
+		*ap->a_retval = MIN(LONG_MAX, FUSE_LINK_MAX);
 		return (0);
 	case _PC_SYMLINK_MAX:
 		*ap->a_retval = MAXPATHLEN;