Fix missed "+0.5" rounding - use rint() instead

In commit 23baf20f569f (Use "rint()" instead of rounding manually with
"+ 0.5") I had missed this one remaining place where we rounded things
by adding "+0.5" and then truncated.

Fix that up.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

dive.c

@@ -513,7 +513,7 @@ static void match_standard_cylinder(cylinder_type_t *type)
 	default:
 		return;
 	}
-	len = snprintf(buffer, sizeof(buffer), fmt, (int) (cuft+0.5));
+	len = snprintf(buffer, sizeof(buffer), fmt, rint(cuft));
 	p = malloc(len+1);
 	if (!p)
 		return;