[POWERPC] arch/ppc/kernel/prom.c of_node_(get|put) cleanup

Remove redundant argument checks for of_node_get() and of_node_put().
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/prom.c

@@ -1221,7 +1221,6 @@ struct device_node *of_find_node_by_name(struct device_node *from,
 		if (np->name != NULL && strcasecmp(np->name, name) == 0
 		    && of_node_get(np))
 			break;
-	if (from)
 	of_node_put(from);
 	read_unlock(&devtree_lock);
 	return np;
@@ -1250,7 +1249,6 @@ struct device_node *of_find_node_by_type(struct device_node *from,
 		if (np->type != 0 && strcasecmp(np->type, type) == 0
 		    && of_node_get(np))
 			break;
-	if (from)
 	of_node_put(from);
 	read_unlock(&devtree_lock);
 	return np;
@@ -1285,7 +1283,6 @@ struct device_node *of_find_compatible_node(struct device_node *from,
 		if (device_is_compatible(np, compatible) && of_node_get(np))
 			break;
 	}
-	if (from)
 	of_node_put(from);
 	read_unlock(&devtree_lock);
 	return np;
@@ -1329,7 +1326,6 @@ struct device_node *of_find_node_by_phandle(phandle handle)
 	for (np = allnodes; np != 0; np = np->allnext)
 		if (np->linux_phandle == handle)
 			break;
-	if (np)
 	of_node_get(np);
 	read_unlock(&devtree_lock);
 	return np;
@@ -1353,7 +1349,6 @@ struct device_node *of_find_all_nodes(struct device_node *prev)
 	for (; np != 0; np = np->allnext)
 		if (of_node_get(np))
 			break;
-	if (prev)
 	of_node_put(prev);
 	read_unlock(&devtree_lock);
 	return np;
@@ -1399,7 +1394,6 @@ struct device_node *of_get_next_child(const struct device_node *node,
 	for (; next != 0; next = next->sibling)
 		if (of_node_get(next))
 			break;
-	if (prev)
 	of_node_put(prev);
 	read_unlock(&devtree_lock);
 	return next;