Fix implementation of timeout properties (#113)

***NO_CI***

Author: josesimoes

System.IO.Ports/SerialPort.cs

@@ -383,14 +383,14 @@ public string NewLine
         /// <exception cref="IOException">The port is in an invalid state. -or- An attempt to set the state of the underlying
         /// port failed. For example, the parameters passed from this <see cref="SerialPort"/>
         /// object were invalid.</exception>
-        /// <exception cref="ArgumentOutOfRangeException">The read time-out value is less than zero and not equal to <see cref="Timeout"/>.</exception>
+        /// <exception cref="ArgumentOutOfRangeException">The read time-out value is less than zero and not equal to <see cref="Timeout.Infinite"/>.</exception>
         public int ReadTimeout
         {
             get => _readTimeout;
 
             set
             {
-                if (value <= 0)
+                if (value < 0 && value != Timeout.Infinite)
                 {
                     throw new ArgumentOutOfRangeException();
                 }
@@ -406,15 +406,14 @@ public int ReadTimeout
         /// <exception cref="IOException">The port is in an invalid state. -or- An attempt to set the state of the underlying
         /// port failed. For example, the parameters passed from this <see cref="SerialPort"/>
         /// object were invalid.</exception>
-        /// <exception cref="ArgumentOutOfRangeException">The <see cref="WriteTimeout"/> value is less than zero and not equal
-        /// to <see cref="Timeout"/>.</exception>
+        /// <exception cref="ArgumentOutOfRangeException">The read time-out value is less than zero and not equal to <see cref="Timeout.Infinite"/>.</exception>
         public int WriteTimeout
         {
             get => _writeTimeout;
 
             set
             {
-                if ((value < 0) && (value != Timeout.Infinite))
+                if (value < 0 && value != Timeout.Infinite)
                 {
                     throw new ArgumentOutOfRangeException();
                 }