Fiddle: Remove extraneous newline from SkDebugf output.

BUG=skia:6247

Change-Id: I69b5fd3fd0f8ed3fe5b7e36d3e389cc4215542c6
Reviewed-on: https://skia-review.googlesource.com/8478
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Joe Gregorio <jcgregorio@google.com>

tools/fiddle/fiddle_main.cpp

@@ -27,7 +27,6 @@ void SkDebugf(const char * fmt, ...) {
     va_end(args);
     if (n>=0 && n<=int(sizeof(formatbuffer))) {
         gTextOutput.write(formatbuffer, n);
-        gTextOutput << '\n';
     }
 }