Bug 729145. Don't ignore curves when we don't have a current point. r=mwoodrow

This was a copy & paste typo and is caught by
http://philip.html5.org/tests/canvas/suite/tests/2d.path.quadraticCurveTo.ensuresubpath.2.html
which is not in our test suite.

--HG--
extra : rebase_source : dc77d4bfa4da0d79e97da1e10e72bbd77223e8fa

gfx/2d/PathCG.cpp

@@ -71,8 +71,7 @@ PathBuilderCG::BezierTo(const Point &aCP1,
 
   if (CGPathIsEmpty(mCGPath))
     MoveTo(aCP1);
-  else
+  CGPathAddCurveToPoint(mCGPath, NULL,
-    CGPathAddCurveToPoint(mCGPath, NULL,
                           aCP1.x, aCP1.y,
                           aCP2.x, aCP2.y,
                           aCP3.x, aCP3.y);
@@ -85,8 +84,7 @@ PathBuilderCG::QuadraticBezierTo(const Point &aCP1,
 {
   if (CGPathIsEmpty(mCGPath))
     MoveTo(aCP1);
-  else
+  CGPathAddQuadCurveToPoint(mCGPath, NULL,
-    CGPathAddQuadCurveToPoint(mCGPath, NULL,
                               aCP1.x, aCP1.y,
                               aCP2.x, aCP2.y);
 }