[CIFS] Fix warnings shown by newer version of sparse

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 97ccc51..66436f5 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1478,7 +1478,7 @@
 			atomic_dec(&open_file->wrtPending);
 			cFYI(1, ("SetFSize for attrs rc = %d", rc));
 			if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
-				int bytes_written;
+				unsigned int bytes_written;
 				rc = CIFSSMBWrite(xid, pTcon,
 						  nfid, 0, attrs->ia_size,
 						  &bytes_written, NULL, NULL,
@@ -1511,7 +1511,7 @@
 					cifs_sb->mnt_cifs_flags &
 						CIFS_MOUNT_MAP_SPECIAL_CHR);
 				if (rc == 0) {
-					int bytes_written;
+					unsigned int bytes_written;
 					rc = CIFSSMBWrite(xid, pTcon,
 							netfid, 0,
 							attrs->ia_size,