[net-next:master 1200/1233] net/ipv4/tcp_recovery.c:24:5: sparse: symbol 'tcp_rack_reo_wnd' was not declared. Should it be static?

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 
master
head:   538e2de104cfb4ef1acb35af42427bff42adbe4d
commit: 20b654dfe1beaca60ab51894ff405a049248433d [1200/1233] tcp: support 
DUPACK threshold in RACK
reproduce:
        # apt-get install sparse
        git checkout 20b654dfe1beaca60ab51894ff405a049248433d
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   net/ipv4/tcp_recovery.c:46:16: sparse: expression using sizeof(void)
   net/ipv4/tcp_recovery.c:46:16: sparse: expression using sizeof(void)
>> net/ipv4/tcp_recovery.c:24:5: sparse: symbol 'tcp_rack_reo_wnd' was not 
>> declared. Should it be static?
   include/net/tcp.h:738:16: sparse: expression using sizeof(void)
   net/ipv4/tcp_recovery.c:102:40: sparse: expression using sizeof(void)
   net/ipv4/tcp_recovery.c:102:40: sparse: expression using sizeof(void)
   include/net/tcp.h:738:16: sparse: expression using sizeof(void)
   net/ipv4/tcp_recovery.c:210:42: sparse: expression using sizeof(void)

Please review and possibly fold the followup patch.

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