xl: remove pointless null pointer check

poolinfo is guaranteed non-null here.

Signed-off-by: Matthew Daley <mattjd@gmail.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/libxl/xl_cmdimpl.c

@@ -5095,8 +5095,8 @@ static int sched_domain_output(libxl_scheduler sched, int (*output)(int),
                 break;
         }
     }
-    if (poolinfo)
-        libxl_cpupoolinfo_list_free(poolinfo, n_pools);
+
+    libxl_cpupoolinfo_list_free(poolinfo, n_pools);
     return 0;
 }