My previous change of replacing the call to sprintf with some memcpy type...

My previous change of replacing the call to sprintf with some memcpy type routines was not correct.  This patch reverts that.

mysql_client_test.c:
  reverting my previous change

tests/mysql_client_test.c

@@ -12907,9 +12907,8 @@ static void test_bug8378()
   /* No escaping should have actually happened. */
   DIE_UNLESS(memcmp(out, TEST_BUG8378_OUT, len) == 0);
 
-  strcpy(buf, "SELECT '");
-  memcpy(buf+8, out, len);
-  buf[8+len] = '\'';
+  sprintf(buf, "SELECT '%s'", out);
+  
   rc=mysql_real_query(mysql, buf, strlen(buf));
   myquery(rc);