libfdt: Fix subnodes() lifetime

Bug: 318431695
Test: atest liblibfdt.integration_test
Change-Id: Ib0ca4c9eb74918896666544793362acfc372e689
diff --git a/libs/libfdt/src/lib.rs b/libs/libfdt/src/lib.rs
index d90f5f0..9782dde 100644
--- a/libs/libfdt/src/lib.rs
+++ b/libs/libfdt/src/lib.rs
@@ -468,7 +468,7 @@
     }
 
     /// Returns an iterator of subnodes
-    pub fn subnodes(&'a self) -> Result<SubnodeIterator<'a>> {
+    pub fn subnodes(&self) -> Result<SubnodeIterator<'a>> {
         SubnodeIterator::new(self)
     }