remove unnecessary forward declaration

src/redis-cli.h

@@ -97,8 +97,6 @@ extern "C" {
 #define CC_FORCE (1<<0)         /* Re-connect if already connected. */
 #define CC_QUIET (1<<1)         /* Don't log connecting errors. */
 
-struct clusterManagerLink;
-
 /* Dict Helpers */
 
 uint64_t dictSdsHash(const void *key);
@@ -248,12 +246,12 @@ typedef struct clusterManagerReshardTableItem {
 
 /* Info about a cluster internal link. */
 
-struct clusterManagerLink {
+typedef struct clusterManagerLink {
     sds node_name;
     sds node_addr;
     int connected;
     int handshaking;
-};
+} clusterManagerLink;
 
 typedef struct typeinfo {
     char *name;