Fix ext2 compilation

Removal of locks.h broke the build due to missing definition of capable()
and current.

fs/ext2/balloc.c

@@ -14,6 +14,7 @@
 #include <linux/config.h>
 #include "ext2.h"
 #include <linux/quotaops.h>
+#include <linux/sched.h>
 
 /*
  * balloc.c contains the blocks allocation and deallocation routines

fs/ext2/ialloc.c

@@ -15,6 +15,7 @@
 #include <linux/config.h>
 #include "ext2.h"
 #include <linux/quotaops.h>
+#include <linux/sched.h>
 
 
 /*