Bug 1862508 - FdPrintf.cpp: removed extra ; after member function definition. r=sylvestre DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D194704

memory/build/FdPrintf.cpp

@@ -45,7 +45,7 @@ class CheckedIncrement {
     }
     mMaxIncrement -= diff;
     mValue = end;
-  };
+  }
 
   void rewind(T pos) {
     size_t diff = mValue - pos;