remove useless sync() calls

unless we had serious kernel bugs, those sync() calls
serve no useful purpose

src/eitd/xmlutil.cpp

@@ -565,7 +565,7 @@ _done:
 	filename  = (std::string)epgdir + "/index.xml";
 	rename(tmpname.c_str(), filename.c_str());
 
-	sync();
+	// sync();
 	printf("[sectionsd] Writing Information finished\n");
 	return ;
 }

src/gui/hdd_menu.cpp

@@ -1200,7 +1200,7 @@ _remount:
 			safe_mkdir(cmd);
 			snprintf(cmd, sizeof(cmd), "%s/plugins", dst.c_str());
 			safe_mkdir(cmd);
-			sync();
+			// sync();
 #if HAVE_TRIPLEDRAGON
 		/* on the tripledragon, we mount via fstab, so we need to add an
 		   fstab entry for dst */

src/zapit/src/getservices.cpp

@@ -1020,7 +1020,7 @@ void CServiceManager::CopyFile(char * from, char * to)
         strcat(cmd, " ");
         strcat(cmd, to);
         system(cmd);
-	sync();
+	// sync();
 }
 
 void CServiceManager::WriteSatHeader(FILE * fd, sat_config_t &config)