debian/postinst: small code improvement

[findit] / debian / postinst

diff --git a/debian/postinst b/debian/postinst
index 887ea06..57fc45c 100755 (executable)
--- a/debian/postinst
+++ b/debian/postinst
@@ -6,6 +6,7 @@
 ## ----------------------------------------------------------------------
 set -e
 
-gtk-update-icon-cache -f /usr/share/icons/hicolor
+oldversion="$2"
+[ -z "$oldversion" ] && gtk-update-icon-cache -f /usr/share/icons/hicolor
 
 exit 0