save m_lasthost in sufficient buff

since hostname can be greater than 256 byes, save lasthost in bigger charbuff
char m_lastHost[512];                // Store the last URL to a webstream

src/Audio.cpp

@@ -2,7 +2,7 @@
  * Audio.cpp
  *
  *  Created on: Oct 26,2018
- *  Updated on: Dec 30a,2021
+ *  Updated on: Dec 31,2021
  *      Author: Wolle (schreibfaul1)
  *
  */
@@ -402,7 +402,7 @@ bool Audio::connecttohost(const char* host, const char* user, const char* pwd) {
         return false;
     }
 
-    if(strlen(host) > 511) {
+    if(strlen(host) >= 512 - 10) {
         if(audio_info) audio_info("Hostaddress is too long");
         return false;
     }

src/Audio.h

@@ -2,7 +2,7 @@
  * Audio.h
  *
  *  Created on: Oct 26,2018
- *  Updated on: Nov 10,2021
+ *  Updated on: Dec 31,2021
  *      Author: Wolle (schreibfaul1)
  */
 
@@ -399,7 +399,7 @@ private:
     const size_t    m_frameSizeFLAC = 4096 * 4;
 
     char            chbuf[512];
-    char            m_lastHost[256];                // Store the last URL to a webstream
+    char            m_lastHost[512];                // Store the last URL to a webstream
     char*           m_playlistBuff = NULL;          // stores playlistdata
     const uint16_t  m_plsBuffEntryLen = 256;        // length of each entry in playlistBuff
     filter_t        m_filter[3];                    // digital filters