preempt: fix kernel build with !CONFIG_BKL

The preempt count logic tries to take the BKL into account, which breaks
when CONFIG_BKL is not set.

Use the same preempt_count offset that we use without CONFIG_PREEMPT
when CONFIG_BKL is disabled.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reported-and-tested-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/hardirq.h

@@ -96,11 +96,15 @@
  */
 #define in_nmi()	(preempt_count() & NMI_MASK)
 
-#if defined(CONFIG_PREEMPT)
+#if defined(CONFIG_PREEMPT) && defined(CONFIG_BKL)
 # define PREEMPT_INATOMIC_BASE kernel_locked()
-# define PREEMPT_CHECK_OFFSET 1
 #else
 # define PREEMPT_INATOMIC_BASE 0
+#endif
+
+#if defined(CONFIG_PREEMPT)
+# define PREEMPT_CHECK_OFFSET 1
+#else
 # define PREEMPT_CHECK_OFFSET 0
 #endif