[PATCH] hexagon: cmpxchg: fix comment after rename of a documentation file

[Randy Dunlap]

Fix comment text after the rename of a document file from .txt to .rst.

Fixes: 387b14684f94 ("docs: locking: convert docs to ReST and rename to *.rst")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Brian Cain <bcain@xxxxxxxxxxxxxx>
Cc: linux-hexagon@xxxxxxxxxxxxxxx
Cc: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
---
 arch/hexagon/include/asm/cmpxchg.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20210625.orig/arch/hexagon/include/asm/cmpxchg.h
+++ linux-next-20210625/arch/hexagon/include/asm/cmpxchg.h
@@ -46,7 +46,7 @@ static inline unsigned long __xchg(unsig
 	sizeof(*(ptr))))
 
 /*
- *  see rt-mutex-design.txt; cmpxchg supposedly checks if *ptr == A and swaps.
+ *  see rt-mutex-design.rst; cmpxchg supposedly checks if *ptr == A and swaps.
  *  looks just like atomic_cmpxchg on our arch currently with a bunch of
  *  variable casting.
  */