testsuite: Fix fam-in-union-alone-in-struct-2.c with unsigned char [PR116148]

As PR116148#c7 shows, fam-in-union-alone-in-struct-2.c still
fails on hppa which is a BE environment, but by checking more
(also confirmed by John in PR116148#c12), it's due to that
signedness of plain char on hppa is signed therefore the value
of with_fam_3_v.a[7] "8f" get sign extended as "ffffff8f" then
the verification will fail.  This patch is to change plain char
with unsigned char to avoid that.

	PR testsuite/116148

gcc/testsuite/ChangeLog:

	* c-c++-common/fam-in-union-alone-in-struct-2.c: Change the type of
	member a[] of union with_fam_3 with unsigned char.

1 files changed, 1 insertions, 1 deletions

diff --git a/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c b/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
index 7845a7f..49960a3 100644
--- a/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
+++ b/gcc/testsuite/c-c++-common/fam-in-union-alone-in-struct-2.c
@@ -14,7 +14,7 @@ union with_fam_2 {
 } with_fam_2_v = {.a = 0x1f2f3f4f};
 
 union with_fam_3 {
-  char a[];  
+  unsigned char a[];  
   int b[];  
 } with_fam_3_v = {.b = {0x1f2f3f4f, 0x5f6f7f8f}};