misc: Fix some unitialized variable warnings that show up with -Os

Makefile

@@ -1,7 +1,7 @@
 BACKEND_NAME = gutenprint52+usb
 EXEC_NAME = dyesub_backend
 
-CFLAGS = -Wall -Wextra -g
+CFLAGS = -Wall -Wextra -g -Os
 LDFLAGS = `pkg-config --libs libusb-1.0`
 CPPFLAGS = `pkg-config --cflags libusb-1.0`
 
@@ -25,9 +25,9 @@ $(BACKENDS): $(EXEC_NAME)
 	ln -sf $(EXEC_NAME) $@
 
 cppcheck:
-	cppcheck -q -v --std=c99 --enable=all -I/usr/include -DURI_PREFIX=\"$(BACKEND_NAME)\" $(SOURCES) 
+	cppcheck -q -v --std=c99 --enable=all -I/usr/include  $(CPPFLAGS)  -DURI_PREFIX=\"$(BACKEND_NAME)\" $(SOURCES) 
 
-install:	
+install:
 	install -o root -m 700 $(EXEC_NAME) $(CUPS_BACKEND_DIR)/$(BACKEND_NAME)
 	mkdir -p $(CUPS_DATA_DIR)/usb
 	install -o root -m 644 blacklist $(CUPS_DATA_DIR)/usb/net.sf.gimp-print.usb-quirks

backend_canonselphy.c

@@ -565,8 +565,7 @@ static void canonselphy_attach(void *vctx, struct libusb_device_handle *dev,
 	/* Special cases for some models */
 	if (ctx->printer->type == P_ES40_CP790) {
 		int i;
-		int printer_type;
-
+		int printer_type = -1;
 		
 		if (desc.idProduct == USB_PID_CANON_CP790)
 			printer_type = P_CP790;

backend_common.c

@@ -463,7 +463,7 @@ static int print_scan_output(struct libusb_device *device,
 		/* Try to claim the printer, and handle transient failures */
 		if (!backend_claim_interface(dev, iface)) {
 			int i;
-			uint8_t endp_up, endp_down;
+			uint8_t endp_up = 0, endp_down = 0;
 			libusb_get_active_config_descriptor(device, &config);
 			for (i = 0 ; i < config->interface[0].altsetting[0].bNumEndpoints ; i++) {
 				if ((config->interface[0].altsetting[0].endpoint[i].bmAttributes & 3) == LIBUSB_TRANSFER_TYPE_BULK) {

backend_shinkos1245.c

@@ -1474,7 +1474,7 @@ top:
 
 		/* Set matte intensity */
 		if (ctx->hdr.mattedepth != 0x7fffffff) {
-			int current;
+			int current = -1;
 			i = shinkos1245_get_matte(ctx, &current);
 			if (i < 0)
 				goto printer_error;
@@ -1483,7 +1483,7 @@ top:
 				if (i < 0)
 					goto printer_error;
 				if (i > 0) {
-					/* We can't set the matte depth if we're printing */
+					INFO("Can't set matte intensity when printing in progres...\n");
 					state = S_IDLE;
 					sleep(1);
 					break;