IMA: drop the word integrity in the audit message

integrity_audit_msg() uses "integrity:" in the audit message. This
violates the (loosely defined) audit system requirements that everything be
a key=value pair and it doesn't provide additional information. This can
be obviously gleaned from the message type. Just drop it.

Signed-off-by: Eric Paris <[e-mail]>
Acked-by: Mimi Zohar <[e-mail]>
Signed-off-by: James Morris <[e-mail]>

security/integrity/ima/ima_audit.c

···
 		return;
 
 	ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
-	audit_log_format(ab, "integrity: pid=%d uid=%u auid=%u ses=%u",
+	audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
 			 current->pid, current_cred()->uid,
 			 audit_get_loginuid(current),
 			 audit_get_sessionid(current));