Segmentation fault on 4.3-1

[Evgeny Li.]

joe 4.3-1 crashes with Segmentation fault(core dumped)
on string containing \\ and UTF-8 chars
(to reproduce, open supplied 'crash.rb' file)

NOTE: joe 4.2 haven't this bug!

gdb output:

GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
...
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x080963e9 in parse (syntax=0x445, line=0x82a5f58, h_state=...,
    charmap=0x82a0fb8) at syntax.c:162
162 h = (stack ? stack->syntax : syntax)->states[h_state.state];
(gdb) where
#0 0x080963e9 in parse (syntax=0x445, line=0x82a5f58, h_state=...,
    charmap=0x82a0fb8) at syntax.c:162
#1 0x0809d2ea in lattr_get (db=0x87085b0, y=0x445, p=0x82a5e68, line=8)
    at lattr.c:303
#2 0x080728b1 in get_context (bw=0x835a508, bw=0x835a508) at tw.c:72
#3 stagen (stalin=0x835d9a8 "\\i^[ I A ~/dev/i/crash.rb (ruby) ",
    bw=0x835a508, s=0x829476b "x", fill=32 ' ') at tw.c:231
#4 0x08072c82 in disptw (w=0x8916928, flg=1) at tw.c:599
#5 0x0805d79e in edupd (flg=1) at main.c:67
#6 0x0805d91e in edloop (flg=0) at main.c:134
#7 0x0804a898 in main (argc=2, real_argv=0xbfbc1fb4, envv=0xbfbc1fc0)
    at main.c:678