drm/radeon: fix bo creation retry path

commit d1c7871ddb1f588b8eb35affd9ee1a3d5e11cd0c upstream.

Retry label was at wrong place in function leading to memory
leak.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>