dpkg: Use warningv() to print message when overriding with --force option

debian/changelog

@@ -10,6 +10,8 @@ dpkg (1.17.4) UNRELEASED; urgency=low
     reloading it from disk, otherwise removals in maintainer scripts will
     not be seen during the current dpkg run.
   * Get rid of dpkg-split global partqueue queue variable.
+  * Use warningv() in dpkg instead of ad-hoc printing message when
+    overriding with --force option.
 
  -- Guillem Jover <guillem@debian.org>  Thu, 05 Dec 2013 11:08:49 +0100
 

src/errors.c

@@ -139,9 +139,7 @@ void forcibleerr(int forceflag, const char *fmt, ...) {
   va_start(args, fmt);
   if (forceflag) {
     warning(_("overriding problem because --force enabled:"));
-    fputc(' ', stderr);
-    vfprintf(stderr, fmt, args);
-    fputc('\n',stderr);
+    warningv(fmt, args);
   } else {
     ohshitv(fmt, args);
   }