fsck_msdos: fatcache: Fix implicit declarations

Change-Id: I4ab603aa97b5a4ea4bdda22bc2c2b31a09d7f1e8
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>
diff --git a/fatcache.c b/fatcache.c
index b63a13a..310547f 100644
--- a/fatcache.c
+++ b/fatcache.c
@@ -25,6 +25,7 @@
 *OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 *IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 */
+#include <stdlib.h>
 #include <string.h>
 #include "dosfs.h"
 #include "ext.h"