locking/lockdep: Move hlock_equal() to the respective #ifdeffery

When hlock_equal() is unused, it prevents kernel builds with clang,
`make W=1` and CONFIG_WERROR=y, CONFIG_LOCKDEP=y and
CONFIG_LOCKDEP_SMALL=n:

  lockdep.c:2005:20: error: unused function 'hlock_equal' [-Werror,-Wunused-function]

Fix this by moving the function to the respective existing ifdeffery
for its the only user.

See also:

  6863f5643dd7 ("kbuild: allow Clang to find unused static inline functions for W=1 build")

Fixes: 68e305678583 ("lockdep: Adjust check_redundant() for recursive read change")
Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Boqun Feng <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: Bill Wendling <[email protected]>
Cc: Justin Stitt <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]

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