altera,libusb_ll,mcsParser: fix some compiler's warnings

Author: trabucayre

src/altera.cpp

@@ -978,7 +978,7 @@ bool Altera::sectors_mask_start_end_addr(const Altera::max10_mem_t *mem,
 		}
 
 		/* decrement eaddr until last bit == 1 found */
-		for (uint8_t i = 3; i >= 0; i--) {
+		for (int8_t i = 3; i >= 0; i--) {
 			if (update_sectors & (1 << i)) {
 				end_bit = i + 1;
 				break;

src/libusb_ll.cpp

@@ -57,7 +57,7 @@ int libusb_ll::get_devices_list(const cable_t *cable)
 		bus_addr = cable->bus_addr;
 		device_addr = cable->device_addr;
 		vid_pid_filter = (vid != 0) && (pid != 0);
-		bus_dev_filter = ~(bus_addr == 0 && device_addr == 0);
+		bus_dev_filter = !(bus_addr == 0 && device_addr == 0);
 	}
 
 	int i = 0;

src/mcsParser.cpp

@@ -94,7 +94,7 @@ int McsParser::parse()
 			_base_addr = (loc_addr << 16);
 			if (_base_addr * 8 > _bit_length)
 				_bit_length = _base_addr * 8;
-			if (_bit_length > _bit_data.size() * 8)
+			if ((size_t)_bit_length > _bit_data.size() * 8)
 				_bit_data.resize(_bit_length / 8);
 			sum += (loc_addr & 0xff) + ((loc_addr >> 8) & 0xff);
 			break;