ac/surface: remove shadowing declaration

Fixes: 7691de0dcef ("ac/surface,radeonsi: move the set/get_bo_metadata code to ac_surface.c")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2929
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4983>
diff --git a/src/amd/common/ac_surface.c b/src/amd/common/ac_surface.c
index 98f1276..1c2c0d8 100644
--- a/src/amd/common/ac_surface.c
+++ b/src/amd/common/ac_surface.c
@@ -2000,8 +2000,8 @@
       uint64_t dcc_offset = 0;
 
       if (surf->dcc_offset) {
-         uint64_t dcc_offset = surf->display_dcc_offset ? surf->display_dcc_offset
-                                                        : surf->dcc_offset;
+         dcc_offset = surf->display_dcc_offset ? surf->display_dcc_offset
+                                               : surf->dcc_offset;
          assert((dcc_offset >> 8) != 0 && (dcc_offset >> 8) < (1 << 24));
       }