rcu: Make RCU_LOCKDEP_WARN() avoid early lockdep checks

Currently, RCU_LOCKDEP_WARN() checks the condition before checking
to see if lockdep is still enabled.  This is necessary to avoid the
false-positive splats fixed by commit 3066820034b5dd ("rcu: Reject
RCU_LOCKDEP_WARN() false positives").  However, the current state can
result in false-positive splats during early boot before lockdep is fully
initialized.  This commit therefore checks debug_lockdep_rcu_enabled()
both before and after checking the condition, thus avoiding both sets
of false-positive error reports.

Reported-by: Steven Rostedt <[email protected]>
Reported-by: Masami Hiramatsu (Google) <[email protected]>
Reported-by: Mathieu Desnoyers <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Mathieu Desnoyers <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Thomas Gleixner <[email protected]>

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