prov/lnx: fix av strncpy

Fix compiler error with strncpy:

prov/lnx/src/lnx_av.c:272:4: warning: ‘strncpy’ specified bound 64 equals destination size [-Wstringop-truncation]
    strncpy(peer_prov->lpp_prov_name, prov_name, FI_NAME_MAX);

Both dest and srouce are FI_NAME_MAX but strncpy is complaining that it doesn't have space for the NULL
terminator if it needs to be truncated. The terminator should already be in the prov_name passed in.
Just turn this into a memcpy to make the compiler happy

Signed-off-by: Alexia Ingerson <[email protected]>

prov/lnx/src/lnx_av.c

@@ -269,7 +269,8 @@ static int lnx_get_or_create_peer_prov(struct dlist_entry *prov_table,
 			dlist_init(&peer_prov->entry);
 			dlist_init(&peer_prov->lpp_map);
 
-			strncpy(peer_prov->lpp_prov_name, prov_name, FI_NAME_MAX);
+			memcpy(peer_prov->lpp_prov_name, prov_name,
+			       FI_NAME_MAX);
 
 			peer_prov->lpp_prov = entry;