silence && || parens clang warning.



git-svn-id: http://skia.googlecode.com/svn/trunk@8764 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index d85d8a5..4d0772c 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -79,7 +79,7 @@
         coverageOutput = static_cast<CoverageOutput>(random->nextULessThan(kCoverageOutputCnt));
         illegalCoverageOutput = (!gpu->caps()->dualSourceBlendingSupport() &&
                                  CoverageOutputUsesSecondaryOutput(coverageOutput)) ||
-                                !dstRead && kCombineWithDst_CoverageOutput == coverageOutput;
+                                (!dstRead && kCombineWithDst_CoverageOutput == coverageOutput);
     } while (illegalCoverageOutput);
 
     fCoverageOutput = coverageOutput;