[IA64] fix: warning: `ql_size' might be used uninitialized

Oops.  Should have caught this before I checked it in.
Signed-off-by: Tony Luck <tony.luck@intel.com>

include/asm-ia64/pgalloc.h

@@ -29,7 +29,7 @@ DECLARE_PER_CPU(long, __pgtable_quicklist_size);
 
 static inline long pgtable_quicklist_total_size(void)
 {
-	long ql_size;
+	long ql_size = 0;
 	int cpuid;
 
 	for_each_online_cpu(cpuid) {