[PATCH] x86_64: cpu_pda array to macro followup correction

Fix one place where the previous change of cpu_pda from being an array
to being a macro was not properly carried out.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/setup64.c

@@ -248,7 +248,7 @@ void __cpuinit cpu_init (void)
 		switch (v + 1) {
 #if DEBUG_STKSZ > EXCEPTION_STKSZ
 		case DEBUG_STACK:
-			cpu_pda[cpu].debugstack = (unsigned long)estacks;
+			cpu_pda(cpu)->debugstack = (unsigned long)estacks;
 			estacks += DEBUG_STKSZ;
 			break;
 #endif