Remove unnecessary semicolons (#9469)

debug.c

@@ -683,7 +683,7 @@ debug_log_dump(FILE *out, unsigned int n)
             int index = current_index - size + i;
             if (index < 0) index += MAX_DEBUG_LOG;
             VM_ASSERT(index <= MAX_DEBUG_LOG);
-            const char *mesg = RUBY_DEBUG_LOG_MEM_ENTRY(index);;
+            const char *mesg = RUBY_DEBUG_LOG_MEM_ENTRY(index);
             fprintf(out, "%4u: %s\n", debug_log.cnt - size + i, mesg);
         }
     }

eval.c

@@ -1829,7 +1829,7 @@ top_include(int argc, VALUE *argv, VALUE self)
 static VALUE
 top_using(VALUE self, VALUE module)
 {
-    const rb_cref_t *cref = CREF_NEXT(rb_vm_cref());;
+    const rb_cref_t *cref = CREF_NEXT(rb_vm_cref());
     rb_control_frame_t *prev_cfp = previous_frame(GET_EC());
     rb_thread_t *th = GET_THREAD();
 

io.c

@@ -2678,7 +2678,7 @@ rb_io_eof(VALUE io)
     READ_CHECK(fptr);
 #if RUBY_CRLF_ENVIRONMENT
     if (!NEED_READCONV(fptr) && NEED_NEWLINE_DECORATOR_ON_READ(fptr)) {
-        return RBOOL(eof(fptr->fd));;
+        return RBOOL(eof(fptr->fd));
     }
 #endif
     return RBOOL(io_fillbuf(fptr) < 0);