translated a few long logn into int64_t for correctness and to avoid compilation warnings as well

src/aof.c

@@ -468,7 +468,7 @@ int rewriteAppendOnlyFile(char *filename) {
                 /* Emit the SADDs needed to rebuild the set */
                 if (o->encoding == REDIS_ENCODING_INTSET) {
                     int ii = 0;
-                    long long llval;
+                    int64_t llval;
                     while(intsetGet(o->ptr,ii++,&llval)) {
                         if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
                         if (fwriteBulkObject(fp,&key) == 0) goto werr;

src/rdb.c

@@ -273,7 +273,7 @@ int rdbSaveObject(FILE *fp, robj *o) {
             dictReleaseIterator(di);
         } else if (o->encoding == REDIS_ENCODING_INTSET) {
             intset *is = o->ptr;
-            long long llval;
+            int64_t llval;
             int i = 0;
 
             if (rdbSaveLen(fp,intsetLen(is)) == -1) return -1;

src/t_set.c

@@ -112,7 +112,7 @@ robj *setTypeNext(setTypeIterator *si) {
             incrRefCount(ret);
         }
     } else if (si->encoding == REDIS_ENCODING_INTSET) {
-        long long llval;
+        int64_t llval;
         if (intsetGet(si->subject->ptr,si->ii++,&llval))
             ret = createStringObjectFromLongLong(llval);
     }