thread.c: Clear an array for method coverage

* thread.c (reset_coverage_i): Clear an
  array for method coverage just like
  line coverage and branch coverage.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

thread.c

@@ -5060,8 +5060,10 @@ reset_coverage_i(st_data_t key, st_data_t val, st_data_t dummy)
     VALUE coverage = (VALUE)val;
     VALUE lines = RARRAY_AREF(coverage, COVERAGE_INDEX_LINES);
     VALUE branches = RARRAY_AREF(coverage, COVERAGE_INDEX_BRANCHES);
+    VALUE methods = RARRAY_AREF(coverage, COVERAGE_INDEX_METHODS);
     if (lines) rb_ary_clear(lines);
     if (branches) rb_ary_clear(branches);
+    if (methods) rb_ary_clear(methods);
     return ST_CONTINUE;
 }