powerpc/powermac: Use of_property_match_string() in pmac_has_backlight_type()

Replace an of_get_property() call by of_property_match_string()
so that this function implementation can be simplified.

Suggested-by: Christophe Leroy <[email protected]>
Link: https://lore.kernel.org/linuxppc-dev/[email protected]/
Suggested-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/linuxppc-dev/[email protected]/
Signed-off-by: Markus Elfring <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: elfring

arch/powerpc/platforms/powermac/backlight.c

@@ -57,18 +57,10 @@ struct backlight_device *pmac_backlight;
 int pmac_has_backlight_type(const char *type)
 {
 	struct device_node* bk_node = of_find_node_by_name(NULL, "backlight");
+	int i = of_property_match_string(bk_node, "backlight-control", type);
 
-	if (bk_node) {
-		const char *prop = of_get_property(bk_node,
-				"backlight-control", NULL);
-		if (prop && strncmp(prop, type, strlen(type)) == 0) {
-			of_node_put(bk_node);
-			return 1;
-		}
-		of_node_put(bk_node);
-	}
-
-	return 0;
+	of_node_put(bk_node);
+	return i >= 0;
 }
 
 static void pmac_backlight_key_worker(struct work_struct *work)