Fix build for LP64 arches with gcc.

gcc complaints that the comparision is always false due to the value
range, and the cast does not prevent the analysis.  Split the LP64
vs. ILP32 clamping as a workaround.

Sponsored by:	The FreeBSD Foundation

sys/fs/nfsclient/nfs_clvnops.c

@@ -3461,7 +3461,11 @@ nfs_pathconf(struct vop_pathconf_args *ap)
 	}
 	switch (ap->a_name) {
 	case _PC_LINK_MAX:
+#ifdef _LP64
+		*ap->a_retval = pc.pc_linkmax;
+#else
 		*ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
+#endif
 		break;
 	case _PC_NAME_MAX:
 		*ap->a_retval = pc.pc_namemax;