platform: cznic: fix function parameter names

A invalid prototype made it into a previous patch, causing an clang warning:

drivers/platform/cznic/turris-signing-key.c:25:55: warning: omitting the parameter name in a function definition is a C23 extension [-Wc23-extensions]

and a slightly different warning with gcc-11 and earlier but not gcc-12 and up:

drivers/platform/cznic/turris-signing-key.c: In function 'turris_signing_key_instantiate':
drivers/platform/cznic/turris-signing-key.c:25:43: error: parameter name omitted

Add the parameters to get a clean build with all compilers.

Fixes: 0b28b70 ("platform: cznic: Add keyctl helpers for Turris platform")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Arnd Bergmann <[email protected]>

Author: arndb

drivers/platform/cznic/turris-signing-key.c

@@ -22,7 +22,8 @@
 
 #include <linux/turris-signing-key.h>
 
-static int turris_signing_key_instantiate(struct key *, struct key_preparsed_payload *)
+static int turris_signing_key_instantiate(struct key *key,
+					  struct key_preparsed_payload *payload)
 {
 	return 0;
 }