LCS: get rid of STOREIDX option. Fix get keys helper.

src/db.c

@@ -1554,30 +1554,30 @@ int *georadiusGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numk
     return keys;
 }
 
-/* LCS ... [STOREIDX <key>] ... */
+/* LCS ... [KEYS <key1> <key2>] ... */
 int *lcsGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys)
 {
     int i;
-    int *keys;
+    int *keys = getKeysTempBuffer;
     UNUSED(cmd);
 
     /* We need to parse the options of the command in order to check for the
-     * "STOREIDX" argument before the STRINGS argument. */
+     * "KEYS" argument before the "STRINGS" argument. */
     for (i = 1; i < argc; i++) {
         char *arg = argv[i]->ptr;
         int moreargs = (argc-1) - i;
 
         if (!strcasecmp(arg, "strings")) {
             break;
-        } else if (!strcasecmp(arg, "storeidx") && moreargs) {
-            keys = getKeysTempBuffer;
+        } else if (!strcasecmp(arg, "keys") && moreargs >= 2) {
             keys[0] = i+1;
-            *numkeys = 1;
+            keys[1] = i+2;
+            *numkeys = 2;
             return keys;
         }
     }
     *numkeys = 0;
-    return NULL;
+    return keys;
 }
 
 /* Helper function to extract keys from memory command.