Remove unused local variable if `MRB_UTF8_STRING` is not set.

Ref #4982 #4983

Remove unused local variable if `MRB_UTF8_STRING` is not set.
Ref #4982 #4983
7277682c · Yukihiro "Matz" Matsumoto · 0f229bfb · 7277682c
Commit 7277682c authored Apr 28, 2020 by Yukihiro "Matz" Matsumoto
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mrbgems/mruby-io/src/io.c mrbgems/mruby-io/src/io.c +3 -1

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--- a/mrbgems/mruby-io/src/io.c
+++ b/mrbgems/mruby-io/src/io.c
@@ -1487,8 +1487,10 @@ static mrb_value
 mrb_io_readchar(mrb_state *mrb, mrb_value self)
 {
  mrb_value buf;
-  unsigned char c;
  mrb_int len = 1;
+#ifdef MRB_UTF8_STRING
+  unsigned char c;
+#endif
  mrb_get_args(mrb, "S", &buf);
  mrb_assert(RSTRING_PTR(buf) > 0);