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Add a byte for the null terminator in ENSURE_6X

Jerry Jamesrequested to merge
loganjerry/clisp:master into master

Siddhesh Poyarekar at RedHat built clisp with -D_FORTIFY_SOURCE=3 (see https://bugzilla.redhat.com/show_bug.cgi?id=2115476). This turned up an issue with the ENSURE_6X macro in modules/syscalls/calls.c. It allocates 6 more bytes than the bytelen for adding six 'X' characters, but the bytelen does not include the null terminator. Increase the number of bytes allocated by 1 to fix this.

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