Toast segfault with comment after define
Using `toast --pnim --preprocess --noheader test.h`

With this code:
```C
#define VALUE 1 /* comment */
char array[VALUE + 1];
```
Produces a segfault:
```# Generated @ 2023-05-04T12:54:57+02:00
# Command line:
#   /home/lchenut/.nimble/pkgs/nimterop-0.6.13/nimterop/toast --pnim --preprocess --noheader test.h

{.push hint[ConvFromXtoItselfNotNeeded]: off.}

Error: internal error: renderer.gsub(nkNone)
Traceback (most recent call last)
toast.nim(227)           toast
cligen.nim(810)          cligenScope
cligen.nim(724)          dispatchmain
toast.nim(153)           main
ast2.nim(1963)           printNim
renderer.nim(1712)       renderTree
renderer.nim(684)        gstmts
renderer.nim(576)        gsub
renderer.nim(1525)       gsub
renderer.nim(576)        gsub
renderer.nim(1262)       gsub
renderer.nim(934)        gsub
renderer.nim(576)        gsub
renderer.nim(1140)       gsub
renderer.nim(640)        gcomma
renderer.nim(604)        gcommaAux
renderer.nim(576)        gsub
renderer.nim(1702)       gsub
msgs.nim(606)            internalErrorImpl
msgs.nim(561)            liMessage
msgs.nim(413)            handleError
msgs.nim(398)            quit
options.nim(584)         isDefined
strtabs.nim(207)         hasKey
strtabs.nim(133)         rawGet
strtabs.nim              myhash
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Segmentation fault (core dumped)
```