[PATCH] selftests/mm: Fix compiler -Wmaybe-uninitialized warning

[Anshuman Khandual]

Following build warning comes up for cow test as 'transferred' variable has
not been initialized. Fix the warning via zero init for the variable.

  CC       cow
cow.c: In function ‘do_test_vmsplice_in_parent’:
cow.c:365:61: warning: ‘transferred’ may be used uninitialized 
[-Wmaybe-uninitialized]
  365 |                 cur = read(fds[0], new + total, transferred - total);
      |                                                 ~~~~~~~~~~~~^~~~~~~
cow.c:296:29: note: ‘transferred’ was declared here
  296 |         ssize_t cur, total, transferred;
      |                             ^~~~~~~~~~~
  CC       compaction_test
  CC       gup_longterm

Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Shuah Khan <sh...@kernel.org>
Cc: linux...@kvack.org
Cc: linux-kselft...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khand...@arm.com>
---
 tools/testing/selftests/mm/cow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/cow.c b/tools/testing/selftests/mm/cow.c
index f0cb14ea8608..b6cfe0a4b7df 100644
--- a/tools/testing/selftests/mm/cow.c
+++ b/tools/testing/selftests/mm/cow.c
@@ -293,7 +293,7 @@ static void do_test_vmsplice_in_parent(char *mem, size_t 
size,
                .iov_base = mem,
                .iov_len = size,
        };
-       ssize_t cur, total, transferred;
+       ssize_t cur, total, transferred = 0;
        struct comm_pipes comm_pipes;
        char *old, *new;
        int ret, fds[2];
-- 
2.43.0