strftime_tz patch from Bernhard Walle

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@894 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

plugin_time.c

@@ -68,6 +68,15 @@ static void my_stftime_tz(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT
     char *old_tz;
 
     old_tz = getenv("TZ");
+
+    /*
+     * because the next setenv() call may overwrite that string, we
+     * duplicate it here
+     */
+    if (old_tz) {
+	old_tz = strdup(old_tz);
+    }
+
     setenv("TZ", tz, 1);
     tzset();
 
@@ -80,6 +89,8 @@ static void my_stftime_tz(RESULT * result, RESULT * arg1, RESULT * arg2, RESULT
     }
     tzset();
 
+    free(old_tz);
+
     SetResult(&result, R_STRING, value);
 }