stat: Use size_t for sizes instead of unsigned

On some platforms (such as IA64) the large page size may results in
slab allocations to be allowed of numbers that do not fit in 32 bit.

Acked-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index e296572..1cf86c0 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -184,7 +184,7 @@
 
 static int stat_open(struct inode *inode, struct file *file)
 {
-	unsigned size = 1024 + 128 * num_possible_cpus();
+	size_t size = 1024 + 128 * num_possible_cpus();
 	char *buf;
 	struct seq_file *m;
 	int res;