btl/openib: remove some dead code

remove useless call to opal_mem_hooks_support_level() and the value local variable.

opal/mca/btl/openib/btl_openib_component.c

@@ -2521,7 +2521,7 @@ btl_openib_component_init(int *num_btl_modules,
     mca_btl_openib_frag_init_data_t *init_data;
     struct dev_distance *dev_sorted;
     float distance;
-    int index, value;
+    int index;
     bool found;
     mca_base_var_source_t source;
     int list_count = 0;
@@ -2887,13 +2887,6 @@ btl_openib_component_init(int *num_btl_modules,
         mca_btl_openib_component.if_exclude_list = NULL;
     }
 
-    /* If we are using ptmalloc2 and there are no posix threads
-       available, this will cause memory corruption.  Refuse to run.
-       Right now, ptmalloc2 is the only memory manager that we have on
-       OS's that support OpenFabrics that provide both FREE and MUNMAP
-       support, so the following test is [currently] good enough... */
-    value = opal_mem_hooks_support_level();
-
 #if OPAL_CUDA_SUPPORT
    if (mca_btl_openib_component.cuda_want_gdr && (0 == opal_leave_pinned)) {
         opal_show_help("help-mpi-btl-openib.txt",