dm-crypt: Use up_read() together with key_put() only once in crypt_set_keyring_key()

dm-crypt: Use up_read() together with key_put() only once in crypt_set_keyring_key()

The combination of the calls “up_read(&key->sem)” and “key_put(key)”
was immediately used after a return code check for a set_key() call
in this function implementation.
Thus use such a function call pair only once instead directly
before the check.

This issue was transformed by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>