usb-loader: fix error path and typo in 'make clean'

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

usb-loader/Makefile

@@ -16,4 +16,4 @@ version.c: ../.git/HEAD ../.git/index
 	echo "" >> $@
 
 clean:
-		rm -f version.c $(OBJS) $(OUTPUT):q:q 
+		rm -f version.c $(OBJS) $(OUTPUT)

usb-loader/mch_flasher.c

@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
+#include <errno.h>
 #include <getopt.h>
 
 #include <libgen.h>
@@ -609,7 +610,11 @@ main(int argc, char *argv[])
 
 	printf("n=%d, mode=%s, nFile=%d, serial=%s, (e=%d,c=%d,s=%d)\n", argc, mode_str, nFile, serial_port, erase,check,scrub);
 
-	serial_open(serial_port, PORT_SPEED);
+	if (serial_open(serial_port, PORT_SPEED) < 0) {
+		fprintf(stderr, "%s: %s: %s\n", argv[0], serial_port,
+			strerror(errno));
+		exit(1);
+	}
 	fprintf(stderr,"Initializing SAM-BA: ");
 	samba_connect(board_rev);
 

usb-loader/serial_linux.c

@@ -21,7 +21,7 @@
 #include <termios.h>
 #include <fcntl.h>
 
-static int serial_fd;
+static int serial_fd = -1;
 
 void serial_set_dtr(int s) // pin 4
 {
@@ -137,4 +137,4 @@ void sys_delay(int msecs)
 void serial_purge()
 {
   while(serial_data_avail()) serial_read_byte();
-}
\ No newline at end of file
+}