INFO loading stats: three fixes.

1. Server unxtime may remain not updated while loading AOF, so ETA is
not updated correctly.

2. Number of processed byte was not initialized.

3. Possible division by zero condition (likely cause of issue #1932).

src/rdb.c

@@ -1087,8 +1087,9 @@ void startLoading(FILE *fp) {
     /* Load the DB */
     server.loading = 1;
     server.loading_start_time = time(NULL);
+    server.loading_loaded_bytes = 0;
     if (fstat(fileno(fp), &sb) == -1) {
-        server.loading_total_bytes = 1; /* just to avoid division by zero */
+        server.loading_total_bytes = 0;
     } else {
         server.loading_total_bytes = sb.st_size;
     }

src/redis.c

@@ -2633,14 +2633,14 @@ sds genRedisInfoString(char *section) {
                                     server.loading_loaded_bytes;
 
             perc = ((double)server.loading_loaded_bytes /
-                   server.loading_total_bytes) * 100;
+                   (server.loading_total_bytes+1)) * 100;
 
-            elapsed = server.unixtime-server.loading_start_time;
+            elapsed = time(NULL)-server.loading_start_time;
             if (elapsed == 0) {
                 eta = 1; /* A fake 1 second figure if we don't have
                             enough info */
             } else {
-                eta = (elapsed*remaining_bytes)/server.loading_loaded_bytes;
+                eta = (elapsed*remaining_bytes)/(server.loading_loaded_bytes+1);
             }
 
             info = sdscatprintf(info,