ENT-13590: Fixed heap buffer overflow in files edit_line (3.24.x)#6001
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Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech> (cherry picked from commit 3615ade)
```
==25903==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x50200004460f at pc 0x7fa23c10ec86 bp 0x7ffef7339c60 sp 0x7ffef7339408
READ of size 1 at 0x50200004460f thread T0
#0 0x7fa23c10ec85 in __interceptor_strncmp ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:497
#1 0x7fa23be8d09b in StringSafeCompareN /tmp/matchpolicy_poc_3369/cfengine-core/libntech/libutils/string_lib.c:254
#2 0x7fa23be8d10f in StringEqualN /tmp/matchpolicy_poc_3369/cfengine-core/libntech/libutils/string_lib.c:268
cfengine#3 0x560644d90e30 in MatchPolicy /tmp/matchpolicy_poc_3369/cfengine-core/cf-agent/files_editline.c:1749
---snip---
0x50200004460f is located 1 bytes to the left of 4-byte region [0x502000044610,0x502000044614)
allocated by thread T0 here:
---snip---
```
Ticket: ENT-13590
Changelog: Title
Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>
(cherry picked from commit 3da06b4)
larsewi
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Backported from #5993