sessions:reenable fboxes

Cannot reproduce this problem.  It may have originally been only observed
on systems - like Cray XC/EX - where xpmem is typically available.
For systems that don't use xpmem, the way the fboxes are backed by
shm or posix shared memory objects should avoid potential segfaults
at mpi_session_finalize.

Signed-off-by: Howard Pritchard <[email protected]>

Author: hppritcha

opal/mca/btl/sm/btl_sm_fifo.h

@@ -157,9 +157,7 @@ static inline bool sm_fifo_write_ep(mca_btl_sm_hdr_t *hdr, struct mca_btl_base_e
         opal_atomic_wmb();
         return mca_btl_sm_fbox_sendi(ep, 0xfe, &rhdr, sizeof(rhdr), NULL, 0);
     }
-#if 0
-    mca_btl_smr_try_fbox_setup (ep, hdr);
-#endif
+    mca_btl_sm_try_fbox_setup (ep, hdr);
     hdr->next = SM_FIFO_FREE;
     sm_fifo_write(ep->fifo, rhdr);