random: adjust comment to account for removed function

Since de492c83 ("prandom: remove unused functions"),
get_random_int() no longer exists, so remove its reference from this
comment.

Fixes: de492c83 ("prandom: remove unused functions")
Signed-off-by: NJason A. Donenfeld <Jason@zx2c4.com>

drivers/char/random.c

@@ -120,7 +120,7 @@ static void try_to_generate_entropy(void);
  * Wait for the input pool to be seeded and thus guaranteed to supply
  * cryptographically secure random numbers. This applies to: the /dev/urandom
  * device, the get_random_bytes function, and the get_random_{u8,u16,u32,u64,
- * int,long} family of functions. Using any of these functions without first
+ * long} family of functions. Using any of these functions without first
  * calling this function forfeits the guarantee of security.
  *
  * Returns: 0 if the input pool has been seeded.