octeontx2-pf: Add check for devm_kcalloc

As the devm_kcalloc may return NULL pointer,
it should be better to add check for the return
value, as same as the others.

Fixes: e8e095b3 ("octeontx2-af: cn10k: Bandwidth profiles config support")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20221122055449.31247-1-jiasheng@iscas.ac.cnSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c

@@ -4985,6 +4985,8 @@ static int nix_setup_ipolicers(struct rvu *rvu,
 		ipolicer->ref_count = devm_kcalloc(rvu->dev,
 						   ipolicer->band_prof.max,
 						   sizeof(u16), GFP_KERNEL);
+		if (!ipolicer->ref_count)
+			return -ENOMEM;
 	}
 
 	/* Set policer timeunit to 2us ie  (19 + 1) * 100 nsec = 2us */