Eliminated compile warning "comparison is always false due to limited range of data type"

Fixed test failed due to mysql_pconnect throw warning
Fixed test failed when host mysql server doesn't listen on 3306

ext/mysql/tests/bug55473.phpt

@@ -18,6 +18,11 @@ mysql.allow_persistent=1
 	$tmp    = NULL;
 	$link   = NULL;
 
+ 	if ($socket)
+        $host = sprintf("%s:%s", $host, $socket);
+    else if ($port)
+        $host = sprintf("%s:%s", $host, $port);
+
 	function connect($host, $user, $passwd) {
 		$conn = mysql_pconnect($host, $user, $passwd);
 		if (!$conn)
@@ -68,4 +73,4 @@ OK
 Warning: mysql_ping(): MySQL server has gone away in %s on line %d
 reconnect
 OK
-done!
+done!

ext/mysql/tests/mysql_pconn_kill.phpt

@@ -64,7 +64,7 @@ mysql.max_persistent=2
 
 	mysql_close($plink);
 
-	if (!($plink = mysql_pconnect($myhost, $user, $passwd)))
+	if (!($plink = @mysql_pconnect($myhost, $user, $passwd)))
 		printf("[009] Cannot create new persistent connection, [%d] %s\n", mysql_errno(), mysql_error());
 	mysql_select_db($db, $plink);
 

ext/mysqlnd/mysqlnd_charset.c

@@ -126,8 +126,8 @@ static unsigned int check_mb_utf8_sequence(const char *start, const char *end)
 		if (!((start[1] ^ 0x80) < 0x40 &&
 			(start[2] ^ 0x80) < 0x40 &&
 			(start[3] ^ 0x80) < 0x40 &&
-				(c >= 0xf1 || start[1] >= 0x90) &&
-				(c <= 0xf3 || start[1] <= 0x8F)))
+				(c >= 0xf1 || start[1] >= (char)0x90) &&
+				(c <= 0xf3 || start[1] <= (char)0x8F)))
 		{
 			return 0;	/* invalid utf8 character */
 		}