of: Don't try to search when phandle == 0

A value of '0' isn't a valid phandle, so searching for a node with that
phandle is pointless. It will result in nothing but false positives.

Signed-off-by: Grant Likely <grant.likely@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 293ed4b687ba..2305dc0382bc 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1021,6 +1021,9 @@ struct device_node *of_find_node_by_phandle(phandle handle)
         struct device_node *np;
         unsigned long flags;
 
+        if (!handle)
+                return NULL;
+
         raw_spin_lock_irqsave(&devtree_lock, flags);
         for (np = of_allnodes; np; np = np->allnext)
                 if (np->phandle == handle)