Fix encoding switches when RUBYOPT is empty or only spaces

* Follow-up of dbbc3583ba432c279f07b1fa0afb0a8a9ba50c91 which broke this.

1 files changed, 3 insertions, 2 deletions

diff --git a/ruby.c b/ruby.c
index 30e0e68360..2b2a91ecac 100644
--- a/ruby.c
+++ b/ruby.c
@@ -895,10 +895,11 @@ moreswitches(const char *s, ruby_cmdline_options_t *opt, int envopt)
     ruby_features_t warn = opt->warn;
     int backtrace_length_limit = opt->backtrace_length_limit;
 
-    opt->src.enc.name = opt->ext.enc.name = opt->intern.enc.name = 0;
-
     while (ISSPACE(*s)) s++;
     if (!*s) return;
+
+    opt->src.enc.name = opt->ext.enc.name = opt->intern.enc.name = 0;
+
     argstr = rb_str_tmp_new((len = strlen(s)) + (envopt!=0));
     argary = rb_str_tmp_new(0);