ARM: socfpga: checking the wrong variable

This is a cut and paste bug.  We had intended to check "sysmgr".

Fixes: e5f8efa5 ("ARM: socfpga: fpga bridge driver support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/fpga/altera-fpga2sdram.c

@@ -123,7 +123,7 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
 	}
 
 	sysmgr = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
-	if (IS_ERR(priv->sdrctl)) {
+	if (IS_ERR(sysmgr)) {
 		dev_err(dev, "regmap for altr,sys-mgr lookup failed.\n");
 		return PTR_ERR(sysmgr);
 	}