[IA64] Remove warnings for gcc 4.0 IA64 compilation.

This patch removes some compilation warnings, mostly
trivially. acpi.c fix also noted by Kenji Kaneshige.

Signed-off-by; Peter Chubb <peterc@gelato.unsw.edu.au>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 28a4529..7e92647 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -899,7 +899,7 @@
 	if ((err = iosapic_init(phys_addr, gsi_base)))
 		return err;
 
-#if CONFIG_ACPI_NUMA
+#ifdef CONFIG_ACPI_NUMA
 	acpi_map_iosapic(handle, 0, NULL, NULL);
 #endif				/* CONFIG_ACPI_NUMA */