Added missing inclusion of <unistd.h>.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3286 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/storage/Node.cpp

@@ -10,6 +10,7 @@
 #include <fs_attr.h> // for struct attr_info
 #include <new>
 #include <string.h>
+#include <unistd.h>
 
 #include <Node.h>
 #include <Entry.h>

src/kits/storage/Session.cpp

@@ -5,6 +5,7 @@
 
 #include <errno.h>
 #include <new.h>
+#include <unistd.h>
 
 #include <Session.h>
 #include <DiskDevice.h>