Address Coverity-reported resource leaks

Mostly in error-paths.

src/sbbs3/js_global.c

@@ -745,6 +745,7 @@ js_require(JSContext *cx, uintN argc, jsval *arglist)
 			JSVALUE_TO_MSTRING(cx, argv[fnarg], filename, NULL);
 			JS_ReportError(cx,"symbol '%s' not defined by script '%s'", property, filename);
 			free(filename);
+			free(property);
 			return(JS_FALSE);
 		}
 	}

src/sbbs3/jsexec.c

@@ -1034,6 +1034,8 @@ long js_exec(const char *fname, const char* buf, char** args)
 		init_debugger(js_runtime, js_cx, dbg_puts, dbg_getline);
 	if((js_script=JS_CompileScript(js_cx, js_glob, js_buf, js_buflen, fname==NULL ? NULL : path, 1))==NULL) {
 		lprintf(LOG_ERR,"!Error compiling script from %s",path);
+		if(js_buf != buf)
+			free(js_buf);
 		return(-1);
 	}
 	if((diff=xp_timer()-start) > 0)

src/sbbs3/msgtoqwk.cpp

@@ -484,7 +484,6 @@ long sbbs_t::msgtoqwk(smbmsg_t* msg, FILE *qwk_fp, long mode, smb_t* smb
 			size++; 
 		}
 
-		free(buf);
 		if(ch!=qwk_newline) {
 			fputc(qwk_newline,qwk_fp); 		/* make sure it ends in newline */
 			size++; 
@@ -515,6 +514,7 @@ long sbbs_t::msgtoqwk(smbmsg_t* msg, FILE *qwk_fp, long mode, smb_t* smb
 			fputc(' ',qwk_fp); 
 		}
 	}
+	free(buf);
 
 	tt=msg->hdr.when_written.time;
 	if(localtime_r(&tt,&tm)==NULL)
@@ -557,7 +557,7 @@ long sbbs_t::msgtoqwk(smbmsg_t* msg, FILE *qwk_fp, long mode, smb_t* smb
 		,(mode&QM_TO_QNET) ? '*' : ' '     /* Net tag line */
 		);
 
-	fseek(qwk_fp,offset,SEEK_SET);
+	(void)fseek(qwk_fp,offset,SEEK_SET);
 	fwrite(str,QWK_BLOCK_LEN,1,qwk_fp);
 	(void)fseek(qwk_fp,size,SEEK_CUR);
 

src/sbbs3/xtrn.cpp

@@ -1339,6 +1339,7 @@ int sbbs_t::external(const char* cmdline, long mode, const char* startup_dir)
  
 		if(*gamedir == 0) {
 			lprintf(LOG_ERR, "No startup directory configured for DOS command-line: %s", cmdline);
+			fclose(dosemubatfp);
 			return -1;
 		}
 
@@ -1370,6 +1371,7 @@ int sbbs_t::external(const char* cmdline, long mode, const char* startup_dir)
 			SAFEPRINTF2(str,"%s%s",cfg.exec_dir, external_bat_fn);
 			if (!fexist(str)) {
 				errormsg(WHERE,ERR_READ,str,0);
+				fclose(dosemubatfp);
 				return(-1);
 			} 
 		}
@@ -1378,6 +1380,7 @@ int sbbs_t::external(const char* cmdline, long mode, const char* startup_dir)
 
 		if (!(externalbatfp=fopen(externalbatsrc,"r"))) {
 			errormsg(WHERE,ERR_OPEN,externalbatsrc,0);
+			fclose(dosemubatfp);
 			return(-1);
 		}