merge revision(s) 7f81f335478a3ca873f34e3bc0af6927819d3e84: [Backport #18734]

	Return `false` where sticky-bit is not provided [Bug #18734]

	---
	 file.c | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

1 files changed, 1 insertions, 1 deletions

diff --git a/file.c b/file.c
index 2d0f323406..6a0e84b8d5 100644
--- a/file.c
+++ b/file.c
@@ -2161,7 +2161,7 @@ rb_file_sticky_p(VALUE obj, VALUE fname)
 #ifdef S_ISVTX
     return check3rdbyte(fname, S_ISVTX);
 #else
-    return Qnil;
+    return Qfalse;
 #endif
 }