ARM: socfpga: checking the wrong variable

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

Fixes: e5f8efa5c8bf ("ARM: socfpga: fpga bridge driver support")
Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Moritz Fischer <[e-mail]>
Acked-by: Alan Tull <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/fpga/altera-fpga2sdram.c

···
 	}
 
 	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);
 	}