kcm: mark helper functions inline

The stub helper functions for the newly added kcm_proc_init/exit interfaces
are defined as 'static' in a header file, which leads to build warnings for
each file that includes them without calling them:

include/net/kcm.h:183:12: error: 'kcm_proc_init' defined but not used [-Werror=unused-function]
include/net/kcm.h:184:13: error: 'kcm_proc_exit' defined but not used [-Werror=unused-function]

This marks the two functions as 'static inline' instead, which avoids the
warnings and is obviously what was meant here.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: cd6e111b ("kcm: Add statistics and proc interfaces")
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/kcm.h

@@ -180,8 +180,8 @@ struct kcm_mux {
 int kcm_proc_init(void);
 void kcm_proc_exit(void);
 #else
-static int kcm_proc_init(void) { return 0; }
-static void kcm_proc_exit(void) { }
+static inline int kcm_proc_init(void) { return 0; }
+static inline void kcm_proc_exit(void) { }
 #endif
 
 static inline void aggregate_psock_stats(struct kcm_psock_stats *stats,