[Tracker] trackerd crashed with the latest svn

[Jerry Tan <Jerry Tan Sun COM>]

when I check out the latest svn, and build, install,
it crashed.


Stack trace:
#0  0xfeb093f0 in countbytes () from /lib/libc.so.1
#1  0xfeb49775 in _ndoprnt () from /lib/libc.so.1
#2  0xfeb4bba0 in vsnprintf () from /lib/libc.so.1
#3  0xfec4d6bb in g_printf_string_upper_bound () from /usr/lib/libglib-2.0.so.0
#4  0xfec6b6eb in g_vasprintf () from /usr/lib/libglib-2.0.so.0
#5  0xfec5b6f2 in g_strdup_vprintf () from /usr/lib/libglib-2.0.so.0
#6  0x0809d871 in tracker_info (
   message=0x81039cc "Indexing %s with service %s and mime %s (existing)")
   at tracker-utils.c:3372
#7  0x08086fbe in tracker_db_index_service (db_con=0x8228a10, info=0x826dd70, 
   service=0x810355d "Applications", meta_table=0x821bd60, 
   attachment_uri=0x0, attachment_service=0x0, get_embedded=1, 
   get_full_text=0, get_thumbs=0) at tracker-db.c:663
#8  0x08085cb5 in tracker_db_index_application (db_con=0x8228a10, 
   info=0x826dd70) at tracker-apps.c:185
#9  0x0806c75c in index_entity (db_con=0x8228a10, info=0x826dd70)
   at trackerd.c:753
#10 0x0806d48d in process_files_thread () at trackerd.c:1308


the reason is :
tracker_info ("Indexing %s with service %s and mime %s (existing)", uri,
service, info->mime);
info->mime is null, so  it crashes.

Add a null check to avoid this crash, here is the simple patch

Index: src/trackerd/tracker-db.c
===================================================================
--- src/trackerd/tracker-db.c   (revision 590)
+++ src/trackerd/tracker-db.c   (working copy)
@@ -656,6 +656,9 @@
               tracker_log ("Service %s not supported yet", service);
               return;
       }
+        if (info->mime == NULL) {
+                info->mime = g_strdup("unknown");
+        }

       if (info->is_new) {