[WARN] Fix printf format specifier

Change-Id: I78420696ad5148c6c45643ac7fe75b9e674c75c9
diff --git a/main.c b/main.c
index 85fb5ff..b2e787a 100644
--- a/main.c
+++ b/main.c
@@ -989,7 +989,7 @@
 
 	/* Validate the number of VMs. There must at least be the primary. */
 	if (secondary_vm_count > CONFIG_HAFNIUM_MAX_VMS - 1) {
-		pr_err("Number of VMs is out of range: %lld\n",
+		pr_err("Number of VMs is out of range: %d\n",
 		       secondary_vm_count);
 		return -EDQUOT;
 	}