tcp_read_sysctl_limits(): simplify vect

I spent some time trying to figure out why vect array
is declared as [2][3], also why vect[0] is not used.
The answer is commit 4bca68ba that removed code using it.

Let's save a few bytes, and make the code more readable.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

kerndat.c

@@ -210,11 +210,11 @@ int kerndat_get_dirty_track(void)
 
 static int tcp_read_sysctl_limits(void)
 {
-	u32 vect[2][3] = { };
+	u32 vect[3] = { };
 	int ret;
 
 	struct sysctl_req req[] = {
-		{ "net/ipv4/tcp_rmem", &vect[1], CTL_U32A(ARRAY_SIZE(vect[1])) },
+		{ "net/ipv4/tcp_rmem", &vect, CTL_U32A(ARRAY_SIZE(vect)) },
 	};
 
 	/*
@@ -227,7 +227,7 @@ static int tcp_read_sysctl_limits(void)
 		goto out;
 	}
 
-	kdat.tcp_max_rshare = min(kdat.tcp_max_rshare, (int)vect[1][2]);
+	kdat.tcp_max_rshare = min(kdat.tcp_max_rshare, (int)vect[2]);
 
 	if (kdat.tcp_max_rshare < 128)
 		pr_warn("The memory limits for TCP queues are suspiciously small\n");