Add missing include.

Change-Id: Icd338791bb7a0d99731c5637e9557de2d293e2b4
diff --git a/jni/fmr/fmr.h b/jni/fmr/fmr.h
index a5803fb..9c2ca6f 100644
--- a/jni/fmr/fmr.h
+++ b/jni/fmr/fmr.h
@@ -21,6 +21,7 @@
 #include <utils/Log.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>