#192 stack-overflow on bezier_spline()

[liuchenyifan]

version: fig2dev Version 3.2.9a
system: ubuntu22.04

use this command to reproduce: fig2dev -L eepic ./poc

message from ASAN:
==3459788==ERROR: AddressSanitizer: stack-overflow on address 0x7ffd116ecff8 (pc 0x555c1ad19488 bp 0x604000000090 sp 0x7ffd116ecff8 T0)
#0 0x555c1ad19488 in bezier_spline /home/ubuntu/asan_program/fig2dev-3.2.9a/fig2dev/dev/genepic.c:1148

SUMMARY: AddressSanitizer: stack-overflow /home/ubuntu/asan_program/fig2dev-3.2.9a/fig2dev/dev/genepic.c:1148 in bezier_spline
==3459788==ABORTING

[tkl]

Commit [dfa8b6] fixes this issue.