alpha: fixup BUG macro

Do usual do {} while (0) dance, otherwise

fs/gfs2/util.c:99: error: expected expression before 'else'
drivers/scsi/lpfc/lpfc_sli.c:363: error: expected expression before 'else'

Signed-off-by: Alexey Dobriyan <[e-mail]>
Acked-by: Ivan Kokshaysky <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/alpha/include/asm/bug.h

···
 
 /* ??? Would be nice to use .gprel32 here, but we can't be sure that the
    function loaded the GP, so this could fail in modules.  */
-#define BUG()	{							\
+#define BUG()	do {							\
 	__asm__ __volatile__(						\
 		"call_pal %0  # bugchk\n\t"				\
 		".long %1\n\t.8byte %2"					\
 		: : "i"(PAL_bugchk), "i"(__LINE__), "i"(__FILE__));	\
-	for ( ; ; ); }
+	for ( ; ; ); } while (0)
 
 #define HAVE_ARCH_BUG
 #endif