s390x: Fix integer literal in skey.c

The code is a 64bit number of which the upper 48 bits must be 0.

Fixes: 965e38a0 ("s390x: Test effect of storage keys on diag 308")
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Message-Id: <20230104175950.731988-1-nsg@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/s390x/skey.c b/s390x/skey.c
index 1167e4d..7c7a809 100644
--- a/s390x/skey.c
+++ b/s390x/skey.c
@@ -320,7 +320,7 @@
 		"lr	%[response],%%r3\n"
 		: [response] "=d" (response)
 		: [ipib] "d" (ipib),
-		  [code] "d" (5)
+		  [code] "d" (5L)
 		: "%r2", "%r3"
 	);
 	report(response == 0x402, "no exception on fetch, response: invalid IPIB");