Quiet a -Wcomma warning.

src/gpu/gl/GrGLProgram.cpp

Index: src/gpu/gl/GrGLProgram.cpp
diff --git a/src/gpu/gl/GrGLProgram.cpp b/src/gpu/gl/GrGLProgram.cpp
index dd73d01dc1e27f40cf1498e6b8b7d4481ea7c49d..86b237266b78b51ecef62452e5972aaf3c630b75 100644
--- a/src/gpu/gl/GrGLProgram.cpp
+++ b/src/gpu/gl/GrGLProgram.cpp
@@ -111,7 +111,8 @@ void GrGLProgram::setFragmentData(const GrPrimitiveProcessor& primProc,
     while (fp && glslFP) {
         glslFP->setData(fProgramDataManager, *fp);
         this->bindTextures(*fp, pipeline.getAllowSRGBInputs(), nextSamplerIdx);
-        fp = iter.next(), glslFP = glslIter.next();
+        fp = iter.next();
+        glslFP = glslIter.next();
     }
     SkASSERT(!fp && !glslFP);
 }