gdb: testsuite: fix wrong comment in gdb.base/charset.c

In gdb/testsuite/gdb.base/charset.c, use "IBM1047" instead of "EBCDIC"
to fix the wrong comment.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

gdb/testsuite/gdb.base/charset.c

diff --git a/gdb/testsuite/gdb.base/charset.c b/gdb/testsuite/gdb.base/charset.c
index 98aa100..dd66252 100644
--- a/gdb/testsuite/gdb.base/charset.c
+++ b/gdb/testsuite/gdb.base/charset.c
@@ -183,7 +183,7 @@ int main ()
                47, 22, 12,
                37, 13, 5,
                11, 74, 17);
-  /* In EBCDIC, the upper-case letters are broken into three separate runs.  */
+  /* In IBM1047, the upper-case letters are broken into three separate runs.  */
   fill_run (ibm1047_string, 7, 9, 193);
   fill_run (ibm1047_string, 16, 9, 209);
   fill_run (ibm1047_string, 25, 8, 226);