Fix use of unitialize variable

Since we we're not using opennodeext(), we don't have the path/fname for
any failure error message here.

CID 515714

src/sbbs3/getnode.cpp

@@ -286,7 +286,7 @@ bool sbbs_t::getnodeext(uint number, char *ext)
 
 	if((node_ext=opennodeext(&cfg))==-1) {
 		memset(ext,0,128);
-		errormsg(WHERE,ERR_OPEN,str,O_RDONLY|O_DENYNONE);
+		errormsg(WHERE,ERR_OPEN,"node.exb",O_RDONLY|O_DENYNONE);
 		return false;
 	}
 

src/sbbs3/putnode.cpp

@@ -112,7 +112,7 @@ bool sbbs_t::putnodeext(uint number, char *ext)
 	number--;   /* make zero based */
 
 	if((node_ext=opennodeext(&cfg))==-1) {
-		errormsg(WHERE,ERR_OPEN,str,O_CREAT|O_RDWR|O_DENYNONE);
+		errormsg(WHERE,ERR_OPEN,"node.exb",O_CREAT|O_RDWR|O_DENYNONE);
 		return false;
 	}
 	for(count=0;count<LOOP_NODEDAB;count++) {