Reviewing use of memset in keyctl_pkey.c

keyctl_pkey_params_get prologue code to set params up

	memset(params, 0, sizeof(*params));
	params->encoding = "raw";

keyctl_pkey_query has the same prologue
and calls keyctl_pkey_params_get.

So remove the prologue.

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Ben Boeckel <mathstuf@gmail.com>