Fix mfrb and mfpub

buildroot/share/git/mfrb

@@ -14,7 +14,7 @@ case "$#" in
 esac
 
 # If the branch isn't currently the PR target
-if [[ ${INFO[4]} != ${INFO[5]} ]]; then
+if [[ ${INFO[3]} != ${INFO[4]} ]]; then
   git fetch upstream
   git rebase upstream/${INFO[3]} && git rebase -i upstream/${INFO[3]}
 fi