examples: Initialize char arrays

examples: Initialize char arrays

"Error: UNINIT (CWE-457):
samba-4.20.0rc2/examples/libsmbclient/testacl.c:35: var_decl: Declaring variable ""value"" without initializer.
samba-4.20.0rc2/examples/libsmbclient/testacl.c:254: uninit_use_in_call: Using uninitialized value ""*value"" as argument to ""%s"" when calling ""printf"". [Note: The source code implementation of the function has been overridden by a builtin model.]
  252|   			}
  253|
  254|-> 			printf(""Attributes for [%s] are:\n%s\n"", path, value);
  255|
  256|   			if (stat_and_retry)"

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>