api: hints: fix type conversion problem in odp_unlikely()

Convert the argument of odp_unlikely() to boolean before passing it
to __builtin_expect() which takes a long int argument. This prevents
implementation-defined behaviour when the argument of odp_unlikely()
does not fit in a long int. In certain systems with 32-bit long,
odp_unlikely() currently turns certain non-zero 64-bit values to zero,
breaking the code that is using odp_unlikely().

Signed-off-by: Janne Peltonen <janne.peltonen@nokia.com>
Reviewed-by: Matias Elo <matias.elo@nokia.com>

include/odp/api/spec/hints.h

@@ -61,7 +61,7 @@ extern "C" {
 /**
  * Branch unlikely taken
  */
-#define odp_unlikely(x) __builtin_expect((x), 0)
+#define odp_unlikely(x) __builtin_expect(!!(x), 0)
 
 /*
  * __builtin_prefetch (const void *addr, rw, locality)