s-s-d: Only print fatal errno string if it was non-zero

debian/changelog

@@ -92,6 +92,7 @@ dpkg (1.15.1) UNRELEASED; urgency=low
     when there's no compiler present. Closes: #526132
   * Preserve faulting errno when printing reason in start-stop-daemon fatal
     function.
+  * Only print fatal errno string in start-stop-daemon if it was non-zero.
 
   [ Frank Lichtenheld ]
   * Dpkg::Version: Remove unnecessary function next_elem which just

utils/start-stop-daemon.c

@@ -229,7 +229,11 @@ fatal(const char *format, ...)
 	va_start(arglist, format);
 	vfprintf(stderr, format, arglist);
 	va_end(arglist);
-	fprintf(stderr, " (%s)\n", strerror(errno_fatal));
+	if (errno_fatal)
+		fprintf(stderr, " (%s)\n", strerror(errno_fatal));
+	else
+		fprintf(stderr, "\n");
+
 	exit(2);
 }