random: remove unnecessary unlikely()

WARN_ON() already contains an unlikely(), so it's not necessary to use
unlikely.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Link: https://lore.kernel.org/r/20190607182517.28266-1-tiny.windzz@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

drivers/char/random.c

@@ -736,10 +736,9 @@ retry:
 		} while (unlikely(entropy_count < pool_size-2 && pnfrac));
 	}
 
-	if (unlikely(entropy_count < 0)) {
+	if (WARN_ON(entropy_count < 0)) {
 		pr_warn("random: negative entropy/overflow: pool %s count %d\n",
 			r->name, entropy_count);
-		WARN_ON(1);
 		entropy_count = 0;
 	} else if (entropy_count > pool_size)
 		entropy_count = pool_size;
@@ -1364,10 +1363,9 @@ retry:
 	if (ibytes < min)
 		ibytes = 0;
 
-	if (unlikely(entropy_count < 0)) {
+	if (WARN_ON(entropy_count < 0)) {
 		pr_warn("random: negative entropy count: pool %s count %d\n",
 			r->name, entropy_count);
-		WARN_ON(1);
 		entropy_count = 0;
 	}
 	nfrac = ibytes << (ENTROPY_SHIFT + 3);