ima: change flags container data type

IMA audit hashes patches introduced new IMA flags and required
space went beyond 8 bits. Currently the only flag is IMA_DIGSIG.
This patch use 16 bit short instead of 8 bit char.
Without this fix IMA signature will be replaced with hash, which
should not happen.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

security/integrity/integrity.h

@@ -48,7 +48,7 @@ struct integrity_iint_cache {
 	struct rb_node rb_node; /* rooted in integrity_iint_tree */
 	struct inode *inode;	/* back pointer to inode in question */
 	u64 version;		/* track inode changes */
-	unsigned char flags;
+	unsigned short flags;
 	struct evm_ima_xattr_data ima_xattr;
 	enum integrity_status ima_status;
 	enum integrity_status evm_status;