Comments starts with #; are not properly processed

[Cheng Lian]

Prepare a script file test.scm with the following contents:

#; 1

Run this script with rsi:

$ ./bin/rsi test.scm
#<undefined>

The #<undefined> is actually an undefined error object, indicating that r_read has failed.

[Cheng Lian]

Fixed in b06b48c. I wrote a wrong commit message ("Bug fix: #8") in that commit.