[gnome-bluetooth] lib: Fix compile time warning in pin.c

[Bastien Nocera <hadess src gnome org>]

commit a84549cd9bac92df62ef6c3e831396a68816a4f9
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Nov 15 13:37:19 2017 +0100

    lib: Fix compile time warning in pin.c
    
    warning: ‘hwdb’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    
    Initialise hwdb and udev to NULL to avoid this warning and the fallout
    if hwdb initialisation fails.

 lib/pin.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/lib/pin.c b/lib/pin.c
index f3248d1..dceb295 100644
--- a/lib/pin.c
+++ b/lib/pin.c
@@ -40,8 +40,8 @@
 char *
 oui_to_vendor (const char *oui)
 {
-       struct udev *udev;
-       struct udev_hwdb *hwdb;
+       struct udev *udev = NULL;
+       struct udev_hwdb *hwdb = NULL;
        struct udev_list_entry *list, *l;
        char *modalias = NULL;
        char *vendor = NULL;