hwrng: amd - release_region must be called after hwrng_unregister

The driver release the memory region before being sure that nobody use
it.

This patch made hwrng_unregister ran before any release was done.
Signed-off-by: NLABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/amd-rng.c

@@ -151,8 +151,9 @@ static void __exit mod_exit(void)
 {
 	u32 pmbase = (unsigned long)amd_rng.priv;
 
-	release_region(pmbase + 0xF0, 8);
 	hwrng_unregister(&amd_rng);
+
+	release_region(pmbase + 0xF0, 8);
 }
 
 module_init(mod_init);