remove debug print

Refs trac:3969

This commit was SVN r29876.

The following Trac tickets were found above:
  Ticket 3969 --> https://svn.open-mpi.org/trac/ompi/ticket/3969

ompi/mca/btl/sm/btl_sm_component.c

@@ -306,7 +306,6 @@ static int mca_btl_sm_component_close(void)
         mca_btl_sm.knem_status_array = NULL;
     }
     if (-1 != mca_btl_sm.knem_fd) {
-        printf("closing knem fd=%d\n", mca_btl_sm.knem_fd);
         close(mca_btl_sm.knem_fd);
         mca_btl_sm.knem_fd = -1;
     }