random: fix typo in comments

s/or/for
Signed-off-by: Schspa Shi <schspa@gmail.com>
Signed-off-by: NJason A. Donenfeld <Jason@zx2c4.com>

drivers/char/random.c

@@ -101,7 +101,7 @@
  * ===============================
  *
  * There are four exported interfaces; two for use within the kernel,
- * and two or use from userspace.
+ * and two for use from userspace.
  *
  * Exported interfaces ---- userspace output
  * -----------------------------------------