of: property: Remove unneeded return variable

This patch removes unneeded return variables, using only
'0' instead.
It fixes the following warning detected by coccinelle:
./drivers/of/property.c:1371:5-8: Unneeded variable: "ret". Return "0"
on line 1388

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/1614676598-105267-1-git-send-email-yang.lee@linux.alibaba.com
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/property.c

@@ -1368,7 +1368,6 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
 	const struct supplier_bindings *s = of_supplier_bindings;
 	unsigned int i = 0;
 	bool matched = false;
-	int ret = 0;
 
 	/* Do not stop at first failed link, link all available suppliers. */
 	while (!matched && s->parse_prop) {
@@ -1385,7 +1384,7 @@ static int of_link_property(struct device_node *con_np, const char *prop_name)
 		}
 		s++;
 	}
-	return ret;
+	return 0;
 }
 
 static int of_fwnode_add_links(struct fwnode_handle *fwnode)