Fix a bunch of warnings.

* avr910.c (avr910_paged_load): possible unitialized use of
rd_size
* jtagmkI.c (jtagmkI_initialize): pointer signedness mixup
* jtagmkII.c (jtagmkII_print_parms1): propagate const'ness
of parameter
* usbasp.c (usbasp_transmit): poiner signedness mixup


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@775 81a1dc3b-b13d-400b-aceb-764788c761c2

usbasp.c

@@ -82,7 +82,7 @@ static int usbasp_transmit(PROGRAMMER * pgm,
 			   functionid,
 			   (send[1] << 8) | send[0],
 			   (send[3] << 8) | send[2],
-			   buffer, buffersize,
+			   (char *)buffer, buffersize,
 			   5000);
   if(nbytes < 0){
     fprintf(stderr, "%s: error: usbasp_transmit: %s\n", progname, usb_strerror());