YAFFS2: fs/yaffs2/yaffs_nand.[hc] - fix build warnings

Fix these:
yaffs_guts.c: In function 'yaffs_Scan':
yaffs_guts.c:5436: warning: pointer targets in passing argument 4 of 'yaffs_QueryInitialBlockState' differ in signedness
yaffs_guts.c: In function 'yaffs_ScanBackwards':
yaffs_guts.c:6017: warning: pointer targets in passing argument 4 of 'yaffs_QueryInitialBlockState' differ in signedness
yaffs_nand.c: In function 'yaffs_QueryInitialBlockState':
yaffs_nand.c:109: warning: pointer targets in passing argument 4 of 'dev->queryNANDBlock' differ in signedness
yaffs_nand.c:113: warning: pointer targets in passing argument 4 of 'yaffs_TagsCompatabilityQueryNANDBlock' differ in signedness

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/fs/yaffs2/yaffs_nand.h b/fs/yaffs2/yaffs_nand.h
index 48e3f7e..f3bedcf 100644
--- a/fs/yaffs2/yaffs_nand.h
+++ b/fs/yaffs2/yaffs_nand.h
@@ -33,7 +33,7 @@
 int yaffs_QueryInitialBlockState(yaffs_Device * dev,
 						 int blockNo,
 						 yaffs_BlockState * state,
-						 unsigned *sequenceNumber);
+						 int *sequenceNumber);
 
 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
 				  int blockInNAND);