Remove dev-mono-linear (#81)

* Remove dev_mono_linear (followup to removal of slab_heap)

* cleanup: use CHECK_HIP rather than ad-hoc error checking

---------

Signed-off-by: Aurelien Bouteiller <aurelien.bouteiller@amd.com>

src/backend_bc.cpp

@@ -42,14 +42,11 @@ namespace rocshmem {
   }
 
 Backend::Backend(MPI_Comm comm) : heap{comm} {
-  int num_cus{};
-  if (hipDeviceGetAttribute(&num_cus, hipDeviceAttributeMultiprocessorCount,
-                            0)) {
-    abort();
-  }
-
   CHECK_HIP(hipGetDevice(&hip_dev_id));
 
+  int num_cus{};
+  CHECK_HIP(hipDeviceGetAttribute(&num_cus, hipDeviceAttributeMultiprocessorCount, hip_dev_id));
+
   /*
    * Initialize 'print_lock' global and copy to the device memory space.
    */