Take care fall-through case of switch in skia

include/gpu/GrTypesPriv.h

Index: include/gpu/GrTypesPriv.h
diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index 6135c14c12198232b67e41dbc7ea63545a278634..6cbd6bb0be3de165bf27d82ea94d086c46258f4d 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -178,6 +178,7 @@ static inline GrSLType GrVertexAttribTypeToSLType(GrVertexAttribType type) {
     switch (type) {
         default:
             SkFAIL("Unsupported type conversion");
+            return kVoid_GrSLType;
         case kUByte_GrVertexAttribType:
         case kFloat_GrVertexAttribType:
             return kFloat_GrSLType;