kfifo: drop __kfifo_dma_out_finish_r()

It is the same as __kfifo_skip_r(), so:
* drop __kfifo_dma_out_finish_r() completely, and
* replace its (only) use by __kfifo_skip_r().
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20240405060826.2521-2-jirislaby@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/kfifo.h

@@ -797,7 +797,7 @@ __kfifo_int_must_check_helper( \
 	const size_t __recsize = sizeof(*__tmp->rectype); \
 	struct __kfifo *__kfifo = &__tmp->kfifo; \
 	if (__recsize) \
-		__kfifo_dma_out_finish_r(__kfifo, __recsize); \
+		__kfifo_skip_r(__kfifo, __recsize); \
 	else \
 		__kfifo->out += __len / sizeof(*__tmp->type); \
 })
@@ -879,8 +879,6 @@ extern void __kfifo_dma_in_finish_r(struct __kfifo *fifo,
 extern unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
 	struct scatterlist *sgl, int nents, unsigned int len, size_t recsize);
 
-extern void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize);
-
 extern unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize);
 
 extern void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize);

lib/kfifo.c

@@ -582,11 +582,3 @@ unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
 }
 EXPORT_SYMBOL(__kfifo_dma_out_prepare_r);
 
-void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize)
-{
-	unsigned int len;
-
-	len = __kfifo_peek_n(fifo, recsize);
-	fifo->out += len + recsize;
-}
-EXPORT_SYMBOL(__kfifo_dma_out_finish_r);