dmaengine: ti: k3-udma-glue: fix build warnng

Fix build warning:
 k3-udma-glue.c: In function ‘k3_udma_glue_cfg_rx_flow’:
 k3-udma-glue.c:662:1: warning: label ‘err_ringrx_free’ defined but not used
 err_ringrx_free:
 ^~~~~~~~~~~~~~~

Fixes: 6a42ce8a

 ("dmaengine: ti: k3-udma: Switch to k3_ringacc_request_rings_pair")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>