random: entropy_bytes is actually bits

The variable 'entropy_bytes' is set from an expression that actually
counts bits.  Fortunately it's also only compared to values that also
count bits.  Rename it accordingly.
Signed-off-by: NGreg Price <price@mit.edu>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

drivers/char/random.c

@@ -666,10 +666,10 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits)
 				  r->entropy_total, _RET_IP_);
 
 	if (r == &input_pool) {
-		int entropy_bytes = entropy_count >> ENTROPY_SHIFT;
+		int entropy_bits = entropy_count >> ENTROPY_SHIFT;
 
 		/* should we wake readers? */
-		if (entropy_bytes >= random_read_wakeup_thresh) {
+		if (entropy_bits >= random_read_wakeup_thresh) {
 			wake_up_interruptible(&random_read_wait);
 			kill_fasync(&fasync, SIGIO, POLL_IN);
 		}
@@ -678,7 +678,7 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits)
 		 * forth between them, until the output pools are 75%
 		 * full.
 		 */
-		if (entropy_bytes > random_write_wakeup_thresh &&
+		if (entropy_bits > random_write_wakeup_thresh &&
 		    r->initialized &&
 		    r->entropy_total >= 2*random_read_wakeup_thresh) {
 			static struct entropy_store *last = &blocking_pool;