Initialize t with memset(.., 0, ..)

This will help ensure that we're not using random garbage on the stack by
accident with respect to the variable

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

tools/tools/ioat/ioatcontrol.c

@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sysexits.h>
 #include <unistd.h>
 
@@ -104,6 +105,8 @@ main(int argc, char **argv)
 	bool fflag, rflag, Eflag, mflag;
 	unsigned modeflags;
 
+	memset(&t, 0, sizeof(t));
+
 	fflag = rflag = Eflag = mflag = false;
 	modeflags = 0;