uprobes: don't leak one fd per uprobe created

An unfortunate typo led to us leaking one fd to uprobe_events
every time we created a uprobe.  (Spotted when creating thousands of
them, and dtprobed ran out of fds.)

Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>

libcommon/uprobes.c

@@ -289,7 +289,7 @@ uprobe_create_named(dev_t dev, ino_t ino, uint64_t addr, const char *spec, int i
 		     args ? args : "");
 
 out:
-	if (fd == -1)
+	if (fd != -1)
 		close(fd);
 	free(args);
 	if (rc < 0) {