t/read-to-pipe-async: fix DNDEBUG support

When DNDEBUG is defined this was trying to call log_err but it didn't
include the header file or link against the relevant .o file. This will
now fully build with -DNDEBUG.

Makefile

@@ -365,7 +365,7 @@ T_DEDUPE_PROGS = t/fio-dedupe
 T_VS_OBJS = t/verify-state.o t/log.o crc/crc32c.o crc/crc32c-intel.o crc/crc32c-arm64.o t/debug.o
 T_VS_PROGS = t/fio-verify-state
 
-T_PIPE_ASYNC_OBJS = t/read-to-pipe-async.o
+T_PIPE_ASYNC_OBJS = t/read-to-pipe-async.o t/log.o
 T_PIPE_ASYNC_PROGS = t/read-to-pipe-async
 
 T_IOU_RING_OBJS = t/io_uring.o lib/rand.o lib/pattern.o lib/strntol.o

t/read-to-pipe-async.c

@@ -35,6 +35,7 @@
 #include <assert.h>
 
 #include "../flist.h"
+#include "../log.h"
 
 #include "compiler/compiler.h"