spapr/drc: Clean up local variable shadowing in rtas_ibm_configure_connector()

spapr/drc: Clean up local variable shadowing in rtas_ibm_configure_connector()

Remove extra 'drc_index' variable to avoid this warning :

  ../hw/ppc/spapr_drc.c: In function ‘rtas_ibm_configure_connector’:
  ../hw/ppc/spapr_drc.c:1240:26: warning: declaration of ‘drc_index’ shadows a previous local [-Wshadow=compatible-local]
   1240 |                 uint32_t drc_index = spapr_drc_index(drc);
        |                          ^~~~~~~~~
  ../hw/ppc/spapr_drc.c:1155:14: note: shadowed declaration is here
   1155 |     uint32_t drc_index;
        |              ^~~~~~~~~

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-ID: <20230918145850.241074-7-clg@kaod.org>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>