libiberty: Fix off-by-one when collecting range expression

Fixes this error during build of fixincludes:

In function ‘byte_regex_compile’,
    inlined from ‘xregcomp’ at ../libiberty/../../libiberty/regex.c:7973:11:
../libiberty/../../libiberty/regex.c:3477:29: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
 3477 |                     str[c1] = '\0';
      |                             ^
../libiberty/../../libiberty/regex.c: In function ‘xregcomp’:
../libiberty/../../libiberty/regex.c:3454:35: note: at offset 128 into destination object ‘str’ of size 128
 3454 |                     unsigned char str[128];     /* Should be large enough.  */
      |                                   ^

	* regex.c (regex_compile): Don't write beyond array bounds when
	collecting range expression.

0 files changed, 0 insertions, 0 deletions