nfp: fix readq on absolute RTsyms

Return the error and report value through the output param.

Fixes: 640917dd ("nfp: support access to absolute RTsyms")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Francois H. Theron <francois.theron@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c

@@ -337,8 +337,10 @@ int __nfp_rtsym_readq(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
 	u64 addr;
 	int err;
 
-	if (sym->type == NFP_RTSYM_TYPE_ABS)
-		return sym->addr;
+	if (sym->type == NFP_RTSYM_TYPE_ABS) {
+		*value = sym->addr;
+		return 0;
+	}
 
 	err = nfp_rtsym_to_dest(cpp, sym, action, token, off, &cpp_id, &addr);
 	if (err)