revert #652

reverting broad cosmetic/style change because:
- increases merge-conflicts
- increases overhead of merging upstream Vim patches
- reasons for change are ambiguous, so default to no change

1 files changed, 1 insertions, 1 deletions

diff --git a/src/os/env.c b/src/os/env.c
index 174f142854..e6cdb92ea8 100644
--- a/src/os/env.c
+++ b/src/os/env.c
@@ -42,7 +42,7 @@ char *os_getenvname_at_index(size_t index)
     return NULL;
   }
   int namesize = 0;
-  while (str[namesize] != '=' && str[namesize] != '\0') {
+  while (str[namesize] != '=' && str[namesize] != NUL) {
     namesize++;
   }
   char *name = (char *)vim_strnsave((char_u *)str, namesize);