libdpkg: Check correctly for out of range negative field width values

Use INT_MIN instead of INT_MAX when checking for negative out of range
values.

Regression introduced in commit 2bf4b48a9a6f7ddf854179b4b74013534e4594b9.

Closes: #676796

debian/changelog

@@ -1,3 +1,10 @@
+dpkg (1.16.4.2) UNRELEASED; urgency=low
+
+  * Check correctly for out of range negative field width values in dpkg-query
+    --show format strings. Regression introduced in 1.16.4. Closes: #676796
+
+ -- Guillem Jover <guillem@debian.org>  Sat, 09 Jun 2012 16:10:33 +0200
+
 dpkg (1.16.4.1) unstable; urgency=low
 
   * Fix explicit file trigger activation. Regression introduced in 1.16.4.

lib/dpkg/pkg-format.c

@@ -86,7 +86,7 @@ parsefield(struct pkg_format_node *cur, const char *fmt, const char *fmtend)
 			       *endptr);
 			return false;
 		}
-		if (w < INT_MAX || w > INT_MAX || errno == ERANGE) {
+		if (w < INT_MIN || w > INT_MAX || errno == ERANGE) {
 			fprintf(stderr, _("field width is out of range\n"));
 			return false;
 		}