[POWERPC] Trivial ps3 warning fixes

Fixes warnings:

arch/powerpc/platforms/ps3/system-bus.c: In function 'ps3_map_sg':
arch/powerpc/platforms/ps3/system-bus.c:278: warning: unused variable 'i'
arch/powerpc/platforms/ps3/system-bus.c:277: warning: unused variable 'dev'
arch/powerpc/platforms/ps3/setup.c:103: warning: 'prealloc' defined but not used
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/ps3/setup.c

@@ -99,6 +99,7 @@ static void ps3_panic(char *str)
 	while(1);
 }
 
+#ifdef CONFIG_FB_PS3
 static void prealloc(struct ps3_prealloc *p)
 {
 	if (!p->size)
@@ -115,7 +116,6 @@ static void prealloc(struct ps3_prealloc *p)
 	       p->address);
 }
 
-#ifdef CONFIG_FB_PS3
 struct ps3_prealloc ps3fb_videomemory = {
     .name = "ps3fb videomemory",
     .size = CONFIG_FB_PS3_DEFAULT_SIZE_M*1024*1024,

arch/powerpc/platforms/ps3/system-bus.c

@@ -274,13 +274,13 @@ static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
 static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
 	enum dma_data_direction direction)
 {
-	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
-	int i;
-
 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 	BUG_ON("do");
 	return -EPERM;
 #else
+	struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+	int i;
+
 	for (i = 0; i < nents; i++, sg++) {
 		int result = ps3_dma_map(dev->d_region,
 			page_to_phys(sg->page) + sg->offset, sg->length,