[MTD] physmap: Fix suspend/resume/shutdown bugs.

Don't call suspend/resume functions if they have not been
defined.
Signed-off-by: Robert Jarzmik <rjarzmik@free.fr>
Acked-By: Jörn Engel <joern@logfs.org>
Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/maps/physmap.c

@@ -201,6 +201,7 @@ static int physmap_flash_suspend(struct platform_device *dev, pm_message_t state
 	int i;
 
 	for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
+		if (info->mtd[i]->suspend)
 			ret |= info->mtd[i]->suspend(info->mtd[i]);
 
 	return ret;
@@ -212,6 +213,7 @@ static int physmap_flash_resume(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
+		if (info->mtd[i]->resume)
 			info->mtd[i]->resume(info->mtd[i]);
 
 	return 0;
@@ -223,6 +225,7 @@ static void physmap_flash_shutdown(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
+		if (info->mtd[i]->suspend && info->mtd[i]->resume)
 			if (info->mtd[i]->suspend(info->mtd[i]) == 0)
 				info->mtd[i]->resume(info->mtd[i]);
 }