jack common: ensure null termination of char arrays

Signed-off-by: Adam Miartus <amiartus@de.adit-jv.com>
(cherry picked from commit 733c147c23)
Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>

Change-Id: I63a7330408d75f21e25426e42260133669a0db0e
(cherry picked from commit 41b58edf09)
Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>

common/JackEngineControl.h

@@ -118,6 +118,7 @@ struct SERVER_EXPORT JackEngineControl : public JackShmMem
         fMaxUsecs = 0;
         ResetRollingUsecs();
         strncpy(fServerName, server_name, sizeof(fServerName));
+        fServerName[sizeof(fServerName) - 1] = 0;
         fCPULoad = 0.f;
         fPeriod = 0;
         fComputation = 0;

common/JackInternalClient.cpp

@@ -77,6 +77,7 @@ int JackInternalClient::Open(const char* server_name, const char* name, jack_uui
     }
 
     strncpy(fServerName, server_name, sizeof(fServerName));
+    fServerName[sizeof(fServerName) - 1] = 0;
 
     // Open server/client direct channel
     char name_res[JACK_CLIENT_NAME_SIZE + 1];

common/JackLibClient.cpp

@@ -106,6 +106,7 @@ int JackLibClient::Open(const char* server_name, const char* name, jack_uuid_t u
     }
     
     strncpy(fServerName, server_name, sizeof(fServerName));
+    fServerName[sizeof(fServerName) - 1] = 0;
 
     // Open server/client channel
     char name_res[JACK_CLIENT_NAME_SIZE+1];