Fix format string warnings on 64 bit compilation related to ssize_t.

This patch fixes compilation warnings related to ssize_t when
dvblast is compiled on 64 bit machine. The fixed warnings are:

comm.c: In function "comm_Read":
comm.c:86:18: warning: format "%d" expects type "int", but argument 3 has type "ssize_t"
comm.c:168:14: warning: format "%d" expects type "int", but argument 5 has type "ssize_t"

dvblastctl.c: In function "main":
dvblastctl.c:248:18: warning: format "%d" expects type "int", but argument 3 has type "ssize_t"

comm.c

@@ -82,7 +82,7 @@ void comm_Read( void )
                        (struct sockaddr *)&sun_client, &sun_length );
     if ( i_size < COMM_HEADER_SIZE )
     {
-        msg_Err( NULL, "cannot read comm socket (%d:%s)\n", i_size,
+        msg_Err( NULL, "cannot read comm socket (%zd:%s)\n", i_size,
                  strerror(errno) );
         return;
     }
@@ -164,7 +164,7 @@ void comm_Read( void )
     p_answer[1] = i_answer;
     p_answer[2] = 0;
     p_answer[3] = 0;
-    msg_Dbg( NULL, "answering %d to %d with size %d", i_answer, i_command,
+    msg_Dbg( NULL, "answering %d to %d with size %zd", i_answer, i_command,
              i_answer_size );
 
     if ( sendto( i_comm_fd, p_answer, i_answer_size + COMM_HEADER_SIZE, 0,

dvblastctl.c

@@ -244,7 +244,7 @@ int main( int i_argc, char **ppsz_argv )
     unlink( psz_client_socket );
     if ( i_size < COMM_HEADER_SIZE )
     {
-        msg_Err( NULL, "cannot recv comm socket (%d:%s)", i_size,
+        msg_Err( NULL, "cannot recv comm socket (%zd:%s)", i_size,
                  strerror(errno) );
         exit(255);
     }