Use NGX_FILE_ERROR for handling file operations errors.
On Win32 platforms 0 is used to indicate errors in file operations, so
comparing against -1 is not portable.
This was not much of an issue in patched code, since only ngx_fd_info() test
is actually reachable on Win32 and in worst case it might result in bogus
error log entry.
Patch by Piotr Sikora.
diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index dc4dc89..87b6d7d 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -679,7 +679,7 @@
ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
"deleting socket %s", name);
- if (ngx_delete_file(name) == -1) {
+ if (ngx_delete_file(name) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_delete_file_n " %s failed", name);
}