fpga: Convert to using %pOF instead of full_name

Now that we have a custom printf format specifier, convert users of
full_name to use %pOF instead. This is preparation to remove storing
of the full path string for each node.

Signed-off-by: Rob Herring <[e-mail]>
Cc: Alan Tull <[e-mail]>
Cc: Moritz Fischer <[e-mail]>
Cc: [e-mail]
Acked-by: Moritz Fischer <[e-mail]>
Signed-off-by: Alan Tull <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/fpga/fpga-region.c

···
 	of_node_put(child_region);
 
 	if (ret)
-		pr_err("firmware-name not allowed in child FPGA region: %s",
-		       child_region->full_name);
+		pr_err("firmware-name not allowed in child FPGA region: %pOF",
+		       child_region);
 
 	return ret;
 }