Fix occurrences of "-Wextra-semi-stmt"

Docs-Preview: https://skia.org/?cl=173761
Change-Id: Iefdb91cd28eabb4b01b7b42a4f300b0b4caf05d9
Reviewed-on: https://skia-review.googlesource.com/c/173761
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 033a47e..043e553 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -901,7 +901,7 @@
         return new SVGSink(pageIndex);
     }
 
-#define SINK(t, sink, ...) if (config->getBackend().equals(t)) { return new sink(__VA_ARGS__); }
+#define SINK(t, sink, ...) if (config->getBackend().equals(t)) return new sink(__VA_ARGS__)
 
     if (FLAGS_cpu) {
         SINK("g8",      RasterSink, kGray_8_SkColorType);
@@ -955,7 +955,7 @@
 }
 
 static Sink* create_via(const SkString& tag, Sink* wrapped) {
-#define VIA(t, via, ...) if (tag.equals(t)) { return new via(__VA_ARGS__); }
+#define VIA(t, via, ...) if (tag.equals(t)) return new via(__VA_ARGS__)
     VIA("gbr",       ViaCSXform,           wrapped, rgb_to_gbr(), true);
     VIA("p3",        ViaCSXform,           wrapped,
                      SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,