vim-patch:8.2.2026: Coverity warns for possibly using not NUL terminated string

Problem:    Coverity warns for possibly using not NUL terminated string.
Solution:   Put a NUL in b0_hname just in case.

e79cdb69a4

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/memline.c

@@ -1548,6 +1548,7 @@ static bool swapfile_unchanged(char *fname)
     char hostname[B0_HNAME_SIZE];
     os_get_hostname(hostname, B0_HNAME_SIZE);
     hostname[B0_HNAME_SIZE - 1] = NUL;
+    b0.b0_hname[B0_HNAME_SIZE - 1] = NUL;  // in case of corruption
     if (STRICMP(b0.b0_hname, hostname) != 0) {
       ret = false;
     }