dpkg-divert: Honour --local when DPKG_MAINTSCRIPT_PACKAGE is present

Regression introduced in commit dc98261980767f258046f8a4c2e020fcdc92c8b6-

Reported-by: Martin Pitt <martin.pitt@ubuntu.com>
Suggested-by: Colin Watson <cjwatson@ubuntu.com>

src/divertcmd.c

@@ -716,7 +716,7 @@ main(int argc, const char * const *argv)
 	myopt(&argv, cmdinfos);
 
 	env_pkgname = getenv("DPKG_MAINTSCRIPT_PACKAGE");
-	if (!opt_pkgname && env_pkgname)
+	if (opt_pkgname_match_any && env_pkgname)
 		setpackage(NULL, env_pkgname);
 
 	if (!cipaction)