Less than zero is an error, not any non-zero value.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@287933 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/asterisk.c

@@ -2915,7 +2915,7 @@ int main(int argc, char *argv[])
 		}
 
 		fd2 = (l.rlim_cur > sizeof(readers) * 8 ? sizeof(readers) * 8 : l.rlim_cur) - 1;
-		if (dup2(fd, fd2)) {
+		if (dup2(fd, fd2) < 0) {
 			ast_log(LOG_WARNING, "Cannot open maximum file descriptor %d at boot? %s\n", fd2, strerror(errno));
 			break;
 		}