btl/vader: silence warnings

remove some dead code (that was likely cherry-picked from master
but is currently not used in the v4.0.x branch)

This is a one-off commit for the v4.0.x branch

Signed-off-by: Gilles Gouaillardet <[email protected]>

Author: ggouaillardet

opal/mca/btl/vader/btl_vader_component.c

@@ -375,20 +375,8 @@ static int mca_btl_base_vader_modex_send (void)
     return rc;
 }
 
-static void mca_btl_vader_select_next_single_copy_mechanism (void)
-{
-    for (int i = 0 ; single_copy_mechanisms[i].value != MCA_BTL_VADER_NONE ; ++i) {
-        if (single_copy_mechanisms[i].value == mca_btl_vader_component.single_copy_mechanism) {
-            mca_btl_vader_component.single_copy_mechanism = single_copy_mechanisms[i+1].value;
-            return;
-        }
-    }
-}
-
 static void mca_btl_vader_check_single_copy (void)
 {
-    int initial_mechanism = mca_btl_vader_component.single_copy_mechanism;
-
     /* single-copy emulation is always used to support AMO's right now */
     mca_btl_vader_sc_emu_init ();
 
@@ -531,7 +519,6 @@ static mca_btl_base_module_t **mca_btl_vader_component_init (int *num_btls,
     mca_btl_vader_check_single_copy ();
 
     if (MCA_BTL_VADER_XPMEM != mca_btl_vader_component.single_copy_mechanism) {
-        const char *base_dir = opal_process_info.proc_session_dir;
         char *sm_file;
 
         rc = asprintf(&sm_file, "%s" OPAL_PATH_SEP "vader_segment.%s.%x.%d", mca_btl_vader_component.backing_directory,