Fix use before free in boot_cbfs (boot.c).
diff --git a/src/boot.c b/src/boot.c
index d80eae4..05de715 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -422,7 +422,7 @@
     if (! CONFIG_COREBOOT_FLASH)
         return;
     int count = ie->subchoice;
-    struct cbfs_file *file;
+    struct cbfs_file *file = NULL;
     for (;;) {
         file = cbfs_findprefix("img/", file);
         if (!file)