virdbustest: Don't pass number of arguments as long long

virdbustest: Don't pass number of arguments as long long

since sizeof(int) != sizeof(long long) on 32bit archs.

This unbreaks virdbustest which otherwise fails like:

 (gdb) bt
 #0  __strlen_sse2_bsf () at ../sysdeps/i386/i686/multiarch/strlen-sse2-bsf.S:50
 #1  0x405907d2 in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
 #2  0x4057c140 in ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
 #3  0x4057e7ec in dbus_message_iter_append_basic () from /lib/i386-linux-gnu/libdbus-1.so.3
 #4  0x400742ec in virDBusMessageIterEncode (args=0xbfd4b8f0 "k\321\004\b.", types=0x804d260 "",
     rootiter=0xbfd4b844) at util/virdbus.c:560
 #5  virDBusMessageEncodeArgs (msg=msg@entry=0x893c278, types=types@entry=0x804d25c "sais",
     args=args@entry=0xbfd4b8d8 "r\320\004\b\003") at util/virdbus.c:921
 #6  0x40075917 in virDBusMessageEncode (msg=0x893c278, types=0x804d25c "sais") at util/virdbus.c:959
 #7  0x0804a4a1 in testMessageArray (args=0x0) at virdbustest.c:195
 #8  0x0804c404 in virtTestRun (title=title@entry=0x804cfcb "Test message array ",
     nloops=nloops@entry=1, body=body@entry=0x804a3f0 <testMessageArray>, data=data@entry=0x0)
     at testutils.c:168
 #9  0x08049346 in mymain () at virdbustest.c:384
 #10 0x0804cb2e in virtTestMain (argc=argc@entry=1, argv=argv@entry=0xbfd4bb24,
     func=func@entry=0x80492c0 <mymain>) at testutils.c:764
 #11 0x080491af in main (argc=1, argv=0xbfd4bb24) at virdbustest.c:393