x86/ucode: Fix missing printk() newline in ucode_probe_amd()

Fixes: 630e8875ab ("x86/ucode: Perform extra SHA2 checks on AMD Fam17h/19h microcode")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
(cherry picked from commit dc645cdf7d)

xen/arch/x86/cpu/microcode/core.c

@@ -874,7 +874,7 @@ int __init early_microcode_init(unsigned long *module_map,
              boot_cpu_data.x86 >= 0x17 )
         {
             printk(XENLOG_WARNING
-                   "Microcode patch additional digest checks disabled");
+                   "Microcode patch additional digest checks disabled\n");
             add_taint(TAINT_CPU_OUT_OF_SPEC);
         }