[PATCH] selftests/vm: silence uninitialized variable warning

[Dan Carpenter <dan.carpenter@oracle.com>]

This code just reads from memory without caring about the data itself.
However static checkers complain that "tmp" is never properly
initialized.  Initialize it to zero and change the name to "dummy" to
show that we don't care about the value stored in it.

Fixes: c4b6cb884011 ("selftests/vm: add hugetlb madvise MADV_DONTNEED MADV_REMOVE test")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 tools/testing/selftests/vm/hugetlb-madvise.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/vm/hugetlb-madvise.c b/tools/testing/selftests/vm/hugetlb-madvise.c
index 6c6af40f5747..3c9943131881 100644
--- a/tools/testing/selftests/vm/hugetlb-madvise.c
+++ b/tools/testing/selftests/vm/hugetlb-madvise.c
@@ -89,10 +89,11 @@ void write_fault_pages(void *addr, unsigned long nr_pages)
 
 void read_fault_pages(void *addr, unsigned long nr_pages)
 {
-	unsigned long i, tmp;
+	unsigned long dummy = 0;
+	unsigned long i;
 
 	for (i = 0; i < nr_pages; i++)
-		tmp += *((unsigned long *)(addr + (i * huge_page_size)));
+		dummy += *((unsigned long *)(addr + (i * huge_page_size)));
 }
 
 int main(int argc, char **argv)
-- 
2.35.1