net: rxrpc: fix clang -Wformat warning

jira LE-1907
Rebuild_History Non-Buildable kernel-5.14.0-284.30.1.el9_2
commit-author Justin Stitt <justinstitt@google.com>
commit 5b47d23

When building with Clang we encounter this warning:
| net/rxrpc/rxkad.c:434:33: error: format specifies type 'unsigned short'
| but the argument has type 'u32' (aka 'unsigned int') [-Werror,-Wformat]
| _leave(" = %d [set %hx]", ret, y);

y is a u32 but the format specifier is `%hx`. Going from unsigned int to
short int results in a loss of data. This is surely not intended
behavior. If it is intended, the warning should be suppressed through
other means.

This patch should get us closer to the goal of enabling the -Wformat
flag for Clang builds.

Link: ClangBuiltLinux/linux#378
	Signed-off-by: Justin Stitt <justinstitt@google.com>
	Reviewed-by: Nathan Chancellor <nathan@kernel.org>
	Acked-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20220707182052.769989-1-justinstitt@google.com
	Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 5b47d23)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

net/rxrpc/rxkad.c

@@ -431,7 +431,7 @@ static int rxkad_secure_packet(struct rxrpc_call *call,
 		break;
 	}
 
-	_leave(" = %d [set %hx]", ret, y);
+	_leave(" = %d [set %x]", ret, y);
 	return ret;
 }