Remove useless complexity from MSET implementation.

src/t_string.c

@@ -301,25 +301,23 @@ void mgetCommand(client *c) {
 }
 
 void msetGenericCommand(client *c, int nx) {
-    int j, busykeys = 0;
+    int j;
 
     if ((c->argc % 2) == 0) {
         addReplyError(c,"wrong number of arguments for MSET");
         return;
     }
+
     /* Handle the NX flag. The MSETNX semantic is to return zero and don't
-     * set nothing at all if at least one already key exists. */
+     * set anything if at least one key alerady exists. */
     if (nx) {
         for (j = 1; j < c->argc; j += 2) {
             if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
-                busykeys++;
-            }
-        }
-        if (busykeys) {
                 addReply(c, shared.czero);
                 return;
             }
         }
+    }
 
     for (j = 1; j < c->argc; j += 2) {
         c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);