OS-1571 Placate gcc -Wparentheses
Reviewed by: Robert Mustacchi <rm@joyent.com>

@@ -552,11 +552,12 @@
 
         /*
          * Get vnode for the real file/dir. We'll have a hold on realvp which
          * we won't vn_rele until hyprlofs_inactive.
          */
-        if (error = lookupname(fspath, UIO_SYSSPACE, FOLLOW, NULLVPP, &realvp))
+        if ((error = lookupname(fspath, UIO_SYSSPACE, FOLLOW, NULLVPP,
+            &realvp)) != 0)
                 return (error);
 
         /* no devices allowed */
         if (IS_DEVVP(realvp)) {
                 VN_RELE(realvp);

@@ -579,11 +580,11 @@
          * important when fspath is a trigger AUTOFS node, since we're really
          * interested in mounting the filesystem AUTOFS mounted as result of
          * the VOP_ACCESS() call not the AUTOFS node itself.
          */
         if (vn_mountedvfs(realvp) != NULL) {
-                if (error = traverse(&realvp)) {
+                if ((error = traverse(&realvp)) != 0) {
                         VN_RELE(realvp);
                         return (error);
                 }
         }