49870: Fix NULL reference in match code more

This reverts "49658: Fix NULL reference in match code." and adds a check
inside the block, as well as a failsafe check at the end.

The above commit (49658) causes a crash due to ll being calculated as
0 which leads to rr being an invalid pointer. Only adding a check for
when ll is 0 just leads to bck-i-search pattern not working at all (the
final hunk).  Restoring the condition and adding an explicit NULL check
for replstr seems to make matters work as intended.

2 files changed, 8 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 4b02f3bc8..3b7cc4921 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,6 +13,8 @@
 	* 49915: Src/Zle/comp.h, Src/Zle/compcore.c: Efficient dedup
 	for unsorted completions
 
+	* 49870: Src/glob.c: Fix NULL reference in match code more
+