lib/vdso: Make __cvdso_clock_getres() static

Fix the following sparse warning in the generic vDSO library:

  linux/lib/vdso/gettimeofday.c:224:5: warning: symbol
  '__cvdso_clock_getres' was not declared. Should it be static?

Make it static and also mark it __maybe_unsed.

Fixes: 502a590 ("lib/vdso: Move fallback invocation to the callers")
Reported-by: Marc Gonzalez <[email protected]>
Signed-off-by: Vincenzo Frascino <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: fvincenzo

lib/vdso/gettimeofday.c

@@ -221,6 +221,7 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res)
 	return 0;
 }
 
+static __maybe_unused
 int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
 {
 	int ret = __cvdso_clock_getres_common(clock, res);