ch4/ofi: Improve code for tracking striping and hashing

The code for decrementing the number of striping or hashing enabled
communicators was difficult to read. Make it simpler.

Author: raffenet

src/mpid/ch4/netmod/ofi/ofi_comm.c

@@ -191,10 +191,12 @@ int MPIDI_OFI_mpi_comm_free_hook(MPIR_Comm * comm)
     MPIR_FUNC_ENTER;
 
     /* If we enabled striping or hashing, decrement the counter. */
-    MPIDI_OFI_global.num_comms_enabled_striping -=
-        (MPIDI_OFI_COMM(comm).enable_striping != 0 ? 1 : 0);
-    MPIDI_OFI_global.num_comms_enabled_hashing -=
-        (MPIDI_OFI_COMM(comm).enable_hashing != 0 ? 1 : 0);
+    if (MPIDI_OFI_COMM(comm).enable_striping) {
+        MPIDI_OFI_global.num_comms_enabled_striping--;
+    }
+    if (MPIDI_OFI_COMM(comm).enable_hashing) {
+        MPIDI_OFI_global.num_comms_enabled_hashing--;
+    }
 
     MPL_free(MPIDI_OFI_COMM(comm).pref_nic);