[PATCH] ppc64: Fix prom.c warnings

arch/ppc64/kernel/prom.c:200: warning: missing braces around initializer
arch/ppc64/kernel/prom.c:200: warning: (near initialization for `hmt_thread_data[0]')
arch/ppc64/kernel/prom.c: In function `prom_hold_cpus':
arch/ppc64/kernel/prom.c:1090: warning: implicit declaration of function `_get_PIR'

arch/ppc64/kernel/prom.c

@@ -186,12 +186,13 @@ extern void copy_and_flush(unsigned long dest, unsigned long src,
 
 extern char cmd_line[512];	/* XXX */
 unsigned long dev_tree_size;
+unsigned long _get_PIR(void);
 
 #ifdef CONFIG_HMT
 struct {
 	unsigned int pir;
 	unsigned int threadid;
-} hmt_thread_data[NR_CPUS] = {0};
+} hmt_thread_data[NR_CPUS];
 #endif /* CONFIG_HMT */
 
 char testString[] = "LINUX\n";