Manages handling fewer entries than cores safely

If the number of entries is fewer than the number of cores then it is being
assumed that you can run this on a single core.

src/hosts/hosts.go

@@ -282,6 +282,9 @@ func removeUnwanted(siteBuff *[]siteList, whitelist *[]string) {
 	// Removing duplicates
 	log.Print("Checking for duplicates")
 	cores := runtime.NumCPU()
+	lenEntry := len(entry)
+
+	if (cores <= lenEntry){
 		fin := make(chan uint)
 		for i := cores; i > 0 ; i-- {
 			go removeDuplicate(entry[i-1:],cores, fin)
@@ -290,7 +293,9 @@ func removeUnwanted(siteBuff *[]siteList, whitelist *[]string) {
 			count :=<-fin
 			c.d =+ count
 		}
-	lenEntry := len(entry)
+	} else {
+		removeDuplicate(entry,1, nil)
+	}
 
 	log.Printf("Total: %d\tDuplicates: %d\tSafeWords: %d\tWhitelisted: %d\n", lenEntry, c.d, c.s, c.w)
 }
@@ -316,8 +321,10 @@ func removeDuplicate (entry []siteEntryPointer, freq int , done chan uint){
 		}
 
 	}
+	if (done != nil){
 		done <- cd
 	}
+}
 
 // write2tmp write the siteBuff to the tempfile
 func write2tmp(tmpdir string, siteBuff *[]siteList) (err error) {