dpkg: Do not print pointers in debug output messages

This does not give any meaningful information, besides the pointers
being equal or different. Print an actual file or package name instead.

debian/changelog

@@ -104,6 +104,8 @@ dpkg (1.17.14) UNRELEASED; urgency=low
   * Test suite:
     - Do not leave temporary files behind on failure or when interrupted.
   * Add --build and --extract command aliases to dpkg-source.
+  * Print file or package names instead of pointers in dpkg debug output,
+    to make it more meaningful and reproducible.
 
   [ Raphaël Hertzog ]
   * Explain better in deb-triggers(5) why interest/activate-noawait should be

src/help.c

@@ -327,8 +327,8 @@ void oldconffsetflags(const struct conffile *searchconff) {
     namenode->flags |= fnnf_old_conff;
     if (!namenode->oldhash)
       namenode->oldhash= searchconff->hash;
-    debug(dbg_conffdetail, "oldconffsetflags '%s' namenode %p flags %o",
-          searchconff->name, namenode, namenode->flags);
+    debug(dbg_conffdetail, "oldconffsetflags '%s' namenode '%s' flags %o",
+          searchconff->name, namenode->name, namenode->flags);
     searchconff= searchconff->next;
   }
 }

src/trigproc.c

@@ -294,7 +294,7 @@ check_trigger_cycle(struct pkginfo *processing_now)
 
 	/* We give up on the _earliest_ package involved. */
 	giveup = tortoise->pkgs->pkg;
-	debug(dbg_triggers, "check_triggers_cycle pnow=%s giveup=%p",
+	debug(dbg_triggers, "check_triggers_cycle pnow=%s giveup=%s",
 	      pkg_name(processing_now, pnaw_always),
 	      pkg_name(giveup, pnaw_always));
 	assert(giveup->status == PKG_STAT_TRIGGERSAWAITED ||