Fix warnings

fs/yaffs2/yaffs_guts.c: In function 'yaffs_VerifyTnodeWorker':
fs/yaffs2/yaffs_guts.c:600: warning: unused variable 'nTnodeBytes'
fs/yaffs2/yaffs_guts.c: In function 'yaffs_VerifyFile':
fs/yaffs2/yaffs_guts.c:649: warning: unused variable 'ok'
fs/yaffs2/yaffs_guts.c: In function 'yaffs_GutsInitialise':
fs/yaffs2/yaffs_guts.c:7276: warning: assignment from incompatible 
pointer type
fs/yaffs2/yaffs_guts.c: At top level:
fs/yaffs2/yaffs_guts.c:394: warning: 'yaffs_SkipFullVerification' 
defined but not used
fs/yaffs2/yaffs_guts.c: In function 'yaffs_CreateNewObject':
fs/yaffs2/yaffs_guts.c:2146: warning: 'tn' may be used uninitialized 
in this function
fs/yaffs2/yaffs_guts.c: In function 'yaffs_MknodObject':
fs/yaffs2/yaffs_guts.c:2261: warning: 'str' may be used uninitialized 
in this function

in CVS from today.

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>