ia64: mca: always make IA64_MCA_DEBUG an expression

At least ia64_mca_log_sal_error_record() expects some statement:

    static void ia64_mca_log_sal_error_record(int sal_info_type)
    {
        ...
        if (irq_safe)
            IA64_MCA_DEBUG("CPU %d: SAL log contains %s error record
",
                smp_processor_id(),
                sal_info_type < ARRAY_SIZE(rec_name) ? rec_name[sal_info_type] : "UNKNOWN");
        ...
    }

Instead of fixing all callers the change expicitly makes IA64_MCA_DEBUG
a non-empty expression.

Link: https://lkml.kernel.org/r/20210328215549.830420-1-slyfox@gentoo.orgSigned-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/ia64/kernel/mca.c

@@ -109,9 +109,9 @@
 #include "irq.h"
 
 #if defined(IA64_MCA_DEBUG_INFO)
-# define IA64_MCA_DEBUG(fmt...)	printk(fmt)
+# define IA64_MCA_DEBUG(fmt...) printk(fmt)
 #else
-# define IA64_MCA_DEBUG(fmt...)
+# define IA64_MCA_DEBUG(fmt...) do {} while (0)
 #endif
 
 #define NOTIFY_INIT(event, regs, arg, spin)				\