lib: clean up put_cpu_var usage

put_cpu_var takes the percpu data, not the data returned from
get_cpu_var.

This doesn't change the behavior.

Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: NShaohua Li <shli@fb.com>
Acked-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

lib/random32.c

@@ -81,7 +81,7 @@ u32 prandom_u32(void)
 	u32 res;
 
 	res = prandom_u32_state(state);
-	put_cpu_var(state);
+	put_cpu_var(net_rand_state);
 
 	return res;
 }
@@ -128,7 +128,7 @@ void prandom_bytes(void *buf, size_t bytes)
 	struct rnd_state *state = &get_cpu_var(net_rand_state);
 
 	prandom_bytes_state(state, buf, bytes);
-	put_cpu_var(state);
+	put_cpu_var(net_rand_state);
 }
 EXPORT_SYMBOL(prandom_bytes);