[PATCH net] hyperv: Fix a compiler warning in netvsc_send()

[David Miller]

From: Haiyang Zhang <haiyangz at microsoft.com>
Date: Tue, 16 Apr 2013 19:34:52 +0000

> The Hyper-V hosts always use 64 bit request id. The guests can have
> 32 or 64 bit pointers which equal to the ulong type size. So we cast
> it to ulong type. And, assigning 32bit integer to 64 bit variable
> works fine.

It works fine, but it's unclean.

Keep the req_id type as "u64", because that's what it is, a 64-bit request ID.