t4201: make use of abbreviation in the test more robust

diff --git a/ctype.c b/ctype.c
index 0bfebb4e75866ba0e97713fab5394490290831c0..fc0225cebd1a4b43654772270826e06fd941a128 100644 (file)
--- a/ctype.c
+++ b/ctype.c
@@ -30,7 +30,7 @@ const unsigned char sane_ctype[256] = {
 };
 
 /* For case-insensitive kwset */
-const char tolower_trans_tbl[256] = {
+const unsigned char tolower_trans_tbl[256] = {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,