[PATCH liburing v2 1/7] test: handle mmap return failures in pollfree test

[Dylan Yudaken <dylany@fb.com>]

Sometimes these mmap's fail, and it causes SEGFAULTS.
I assume this was accidentally left off when this was originally landed.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
---
 test/pollfree.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/pollfree.c b/test/pollfree.c
index e2511df..d753ffe 100644
--- a/test/pollfree.c
+++ b/test/pollfree.c
@@ -406,10 +406,10 @@ int main(int argc, char *argv[])
   ret = mmap((void *)0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
   if (ret == MAP_FAILED)
     return 0;
-  mmap((void *)0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
+  ret = mmap((void *)0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
   if (ret == MAP_FAILED)
     return 0;
-  mmap((void *)0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
+  ret = mmap((void *)0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
   if (ret == MAP_FAILED)
     return 0;
   loop();
-- 
2.30.2