[PATCH] coverity: ipmi: avoid overrun of ipmi_interfaces[]

Fix overrun of static array "ipmi_interfaces" of size 4 at position 4 with
index variable "if_num".

Definitions involved:
297  	#define MAX_IPMI_INTERFACES 4
298  	static ipmi_smi_t ipmi_interfaces[MAX_IPMI_INTERFACES];
Signed-off-by: NZaur Kambarov <zkambarov@coverity.com>
Cc: Corey Minyard <minyard@acm.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/char/ipmi/ipmi_msghandler.c

@@ -641,7 +641,7 @@ int ipmi_create_user(unsigned int          if_num,
 		return -ENOMEM;
 
 	down_read(&interfaces_sem);
-	if ((if_num > MAX_IPMI_INTERFACES) || ipmi_interfaces[if_num] == NULL)
+	if ((if_num >= MAX_IPMI_INTERFACES) || ipmi_interfaces[if_num] == NULL)
 	{
 		rv = -EINVAL;
 		goto out_unlock;