[pushed, obvious] testsuite: cast argument to char* in can_deref_null [PR126261]

[Torbjörn SVENSSON]

Pushed below obvious patch as r17-2565-gd97947a3067c13, 
r16-9316-g6a38fff9531838 and r15-11400-g223e11e08039a8.

--

gcc/testsuite/ChangeLog:

        PR testsuite/126261
        * lib/target-supports.exp (check_effective_target_can_deref_null):
        Cast argument to char*.

Signed-off-by: Torbjörn SVENSSON <torbjorn.svens...@foss.st.com>
---
 gcc/testsuite/lib/target-supports.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index de98aeb2731..f4319777951 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -15183,7 +15183,7 @@ proc check_effective_target_can_deref_null { } {
        int
        main ()
        {
-         read_mem (0);
+         read_mem ((char *)0);
          return 0;
        }
       } "-O0 -fno-delete-null-pointer-checks -Wno-null-dereference"]
-- 
2.43.0