Remove extraneous semicolon

Bug: http://b/122481018

Upcoming clang update has a warning, -Wextra-semi-stmt, that warns about
extra semicolons.  Remove extra semi-colon after an 'if' statement.

Test: Build with new Clang.
Change-Id: I05e7c027126b2ed6e61da8e749bbb813b7afd0e3
diff --git a/include/hardware/keymaster_defs.h b/include/hardware/keymaster_defs.h
index cec486e..196062e 100644
--- a/include/hardware/keymaster_defs.h
+++ b/include/hardware/keymaster_defs.h
@@ -586,7 +586,7 @@
                 return -1;
             if (a->blob.data_length > b->blob.data_length)
                 return 1;
-        };
+        }
     }
 
     return 0;