zram: use size_t instead of u16

Some architectures (eg, hexagon and PowerPC) could use PAGE_SHIFT of 16
or more. In these cases u16 is not sufficiently large to represent a
compressed page's size so use size_t.

Signed-off-by: Minchan Kim <[e-mail]>
Reported-by: Weijie Yang <[e-mail]>
Acked-by: Sergey Senozhatsky <[e-mail]>
Cc: Jerome Marchand <[e-mail]>
Cc: Nitin Gupta <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/block/zram/zram_drv.c

···
 	unsigned char *cmem;
 	struct zram_meta *meta = zram->meta;
 	unsigned long handle;
-	u16 size;
+	size_t size;
 
 	read_lock(&meta->tb_lock);
 	handle = meta->table[index].handle;