Fix double free in descriptor parsing error path

Pointed out by Shannon Chuang.

1 files changed, 1 insertions, 0 deletions

diff --git a/libusb/descriptor.c b/libusb/descriptor.c
index 2fed1e9..ce0b661 100644
--- a/libusb/descriptor.c
+++ b/libusb/descriptor.c
@@ -174,6 +174,7 @@ static void clear_interface(struct libusb_interface *interface)
 			}
 		}
 		free((void *) interface->altsetting);
+		interface->altsetting = NULL;
 	}
 	
 }