xenpaging: do not use DPRINTF/ERROR if xch handle is unavailable

Fix DPRINTF/ERROR usage. Both macros reference a xch variable in local scope.
If xc_interface_open fails and after xc_interface_close, both can not be used
anymore. Use standard fprintf for this case.

Remove the code to print the exit value, its not really useful.
Its a left-over for debugging from an earlier patch.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/xenpaging/xenpaging.c

@@ -539,7 +539,7 @@ int main(int argc, char *argv[])
     paging = xenpaging_init(&xch, domain_id);
     if ( paging == NULL )
     {
-        ERROR("Error initialising paging");
+        fprintf(stderr, "Error initialising paging");
         return 1;
     }
 
@@ -688,12 +688,10 @@ int main(int argc, char *argv[])
     /* Tear down domain paging */
     rc1 = xenpaging_teardown(xch, paging);
     if ( rc1 != 0 )
-        ERROR("Error tearing down paging");
+        fprintf(stderr, "Error tearing down paging");
 
     if ( rc == 0 )
         rc = rc1;
-
-    DPRINTF("xenpaging exit code %d\n", rc);
     return rc;
 }