Fix compiler warnings
diff --git a/rmihidtool/main.cpp b/rmihidtool/main.cpp
index 45d5721..8641b3b 100644
--- a/rmihidtool/main.cpp
+++ b/rmihidtool/main.cpp
@@ -213,9 +213,9 @@
 		{0, 0, 0, 0},
 	};
 	enum rmihidtool_cmd cmd = RMIHIDTOOL_CMD_INTERACTIVE;
-	unsigned int addr;
-	unsigned int len;
-	char * data;
+	unsigned int addr = 0;
+	unsigned int len = 0;
+	char * data = NULL;
 	char * start;
 	char * end;