Linux backend: fix ressource leak
    
    Issue detected by Coverity:
    22. leaked_handle: Handle variable fd going out of scope leaks the handle.
    
    Signed-off-by: Ludovic Rousseau <ludovic.rousseau@free.fr>
    (cherry picked from commit 1bb774ca7e5cb100e1fb7ac287e561b2155da70e)
    
    patch_name: 0003-Linux-backend-fix-ressource-leak.patch
    present_in_specfile: true
    location_in_specfile: 3
    squash_commits: true