code cleanup: force local var before calling a for loop, make sure it's unset when no longer needed

lib/pkgman.sh

@@ -31,9 +31,11 @@ pkginst()
     if [[ ! $INSTALL_MODE == dev ]]; then
         $PKG_MAN $COM_INSTALL $@
     else
+        local pkg=
         for pkg in $@; do
             $PKG_MAN $COM_INSTALL $pkg
         done
+        unset pkg
     fi
 }
 export -f pkginst
@@ -61,9 +63,11 @@ pkgrem()
     if [[ ! $INSTALL_MODE == dev ]]; then
         $PKG_MAN $COM_REMOVE $@
     else
+        local pkg=
         for pkg in $@; do
             $PKG_MAN $COM_REMOVE $pkg
         done
+        uset pkg
     fi
 }
 export -f pkgrem