Further improved tmpfs management

makepackage

@@ -188,8 +188,8 @@ fi
 }
 
 tmpumount(){
-  grep $PWD/jails/$UPSTREAM-$ARCH/tmp /proc/mounts && return
-  umount $PWD/jails/$UPSTREAM-$ARCH/tmp && return
+  grep jails/$UPSTREAM-$ARCH/tmp /proc/mounts -q || return
+  umount jails/$UPSTREAM-$ARCH/tmp && return
   echo ERROR: could not umount tmpfs at jails/$UPSTREAM-$ARCH/tmp
   exit 1
 }