Remove extra semicolon

Causes a warning-treated-as-error with Chromium's Clang.

Change-Id: Idd3b6492fe2a532eca387f571cc2f9b6796d07df
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/269196
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>

Author: dogben

src/gpu/mtl/GrMtlPipelineStateDataManager.mm

@@ -31,7 +31,7 @@
         SkDEBUGCODE(
             uniform.fArrayCount = uniformInfo.fVariable.getArrayCount();
             uniform.fType = uniformInfo.fVariable.getType();
-        );
+        )
         uniform.fOffset = uniformInfo.fUBOffset;
     }
 }