few minor update fix

profile.d/updates.sh

@@ -97,6 +97,7 @@ check_updates()
     unset lastver vfile
     return $result
 }
+export -f check_updates
 # ------------------------------------------------------------------------------
 
 
@@ -141,15 +142,17 @@ profile_upgrade()
 
     if [[ -d $MYPATH/.git ]]; then
         disp I "Git installation detected, applying git pull."
-        local curdir=$(pwd)
-        cd $MYPATH
+        pushd "$MYPATH" || {
+            disp E "Failed to change directory to $MYPATH."
+            return 3
+        }
         git pull || {
             disp E "Git pull failed, upgrade not applyed."
-            cd "$curdir"
+            popd
             return 2
         }
         disp I "Successfully upgraded using git."
-        cd "$curdir"
+        popd
     else
         disp I "No Git detected. Downloading and applying upgrade from archive..."
         local tmpdir="/tmp/profile_upg.$$"
@@ -182,6 +185,7 @@ profile_upgrade()
         rm -rf "$tmpdir"
     fi
 }
+export -f profile_upgrade
 # ------------------------------------------------------------------------------