A bad parameter definition in function RegisterExtension resulted in the same value entry being written every time ("${EXT}"="").
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 506b7918936d668d221f79b9e926cf96c32c5005)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>