Fix compiler warning in pritest.c.

* Made do_channel() exit on a failed write().

(closes issue PRI-145)
Reported by: Tzafrir Cohen
Patches:
      fix_unused_write.patch (license #5035) patch uploaded by Tzafrir Cohen
      Modified


git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@2305 2fbb986a-6c06-0410-b554-c9c1f0a7f128

pritest.c

@@ -68,7 +68,10 @@ static void do_channel(int fd)
 	int i=0;
 
 	while ((res = read(fd, buf, READ_SIZE)) > 0 && (i++ < 1000)) {
-		write(fd, buf, res);
+		if (write(fd, buf, res) == -1) {
+			fprintf(stderr, "--!! Failed write: %d\n", errno);
+			break;
+		}
 	}
 }