of: overlay: make all pr_debug() and pr_err() messages unique

Make overlay.c debug and error messages unique so that they can be
unambiguously found by grep.
Tested-by: Alan Tull <atull@kernel.org>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>

drivers/of/overlay.c

@@ -507,7 +507,7 @@ static int build_changeset_symbols_node(struct overlay_changeset *ovcs,
 	for_each_property_of_node(overlay_symbols_node, prop) {
 		ret = add_changeset_property(ovcs, target, prop, 1);
 		if (ret) {
-			pr_debug("Failed to apply prop @%pOF/%s, err=%d\n",
+			pr_debug("Failed to apply symbols prop @%pOF/%s, err=%d\n",
 				 target->np, prop->name, ret);
 			return ret;
 		}
@@ -551,7 +551,8 @@ static int build_changeset(struct overlay_changeset *ovcs)
 		ret = build_changeset_next_level(ovcs, &target,
 						 fragment->overlay);
 		if (ret) {
-			pr_debug("apply failed '%pOF'\n", fragment->target);
+			pr_debug("fragment apply failed '%pOF'\n",
+				 fragment->target);
 			return ret;
 		}
 	}
@@ -564,7 +565,8 @@ static int build_changeset(struct overlay_changeset *ovcs)
 		ret = build_changeset_symbols_node(ovcs, &target,
 						   fragment->overlay);
 		if (ret) {
-			pr_debug("apply failed '%pOF'\n", fragment->target);
+			pr_debug("symbols fragment apply failed '%pOF'\n",
+				 fragment->target);
 			return ret;
 		}
 	}
@@ -873,7 +875,7 @@ static int of_overlay_apply(const void *fdt, struct device_node *tree,
 
 	ret = __of_changeset_apply_notify(&ovcs->cset);
 	if (ret)
-		pr_err("overlay changeset entry notify error %d\n", ret);
+		pr_err("overlay apply changeset entry notify error %d\n", ret);
 	/* notify failure is not fatal, continue */
 
 	list_add_tail(&ovcs->ovcs_list, &ovcs_list);
@@ -1132,7 +1134,7 @@ int of_overlay_remove(int *ovcs_id)
 
 	ret = __of_changeset_revert_notify(&ovcs->cset);
 	if (ret)
-		pr_err("overlay changeset entry notify error %d\n", ret);
+		pr_err("overlay remove changeset entry notify error %d\n", ret);
 	/* notify failure is not fatal, continue */
 
 	*ovcs_id = 0;