Add error exit 9 if fspd can't send reply back

ChangeLog

@@ -11,6 +11,7 @@ Version NEXT
 	  because we closing these later. This should help systemd internal
 	  inetd to work correctly using fspd socket activation.
 	fspd exits with err 8 if can't write pidfile after forking
+	add error exit 9 if fspd can't send back reply to client
 
 Version 2.8.1b29 - 24 Aug 2019
 	added scons command line argument without-fspscan=yes for building

man/fspd.1

@@ -208,6 +208,9 @@ select() error
 .B 8
 can not write pidfile
 
+.B 9
+can not send reply back to client
+
 .B 99
 Internal terror
 

server/server.c

@@ -365,7 +365,7 @@ fprintf(stderr,"\n") ;
   if(sendto(myfd,(char *)ub,(len1 + len2 + UBUF_HSIZE),0,
 	    (struct sockaddr *)from,sizeof(struct sockaddr_in)) == -1) {
     perror("sendto");
-    exit(7);
+    exit(9);
   }
 
 return(0);