lwtunnel: Fix the sparse warnings in fib_encap_match
When CONFIG_LWTUNNEL config is not enabled, the lwtstate_free() is not declared in lwtunnel.h at all. However, even in this case, the function is still referenced in fib_semantics.c so that there appears the following sparse warnings: net/ipv4/fib_semantics.c:553:17: error: undefined identifier 'lwtstate_free' CC net/ipv4/fib_semantics.o net/ipv4/fib_semantics.c: In function ‘fib_encap_match’: net/ipv4/fib_semantics.c:553:3: error: implicit declaration of function ‘lwtstate_free’ [-Werror=implicit-function-declaration] cc1: some warnings being treated as errors make[1]: *** [net/ipv4/fib_semantics.o] Error 1 make: *** [net/ipv4/fib_semantics.o] Error 2 To eliminate the error, we define an empty function for lwtstate_free() in lwtunnel.h when CONFIG_LWTUNNEL is disabled. Fixes: df383e62 ("lwtunnel: fix memory leak") Cc: Jiri Benc <jbenc@redhat.com> Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Ying Xue <ying.xue@windriver.com> Acked-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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