Cluster: fix case for getKeysInSlot() and countKeysInSlot().

Redis functions start in low case. A few functions about cluster were
capitalized the wrong way.

src/cluster.c

@@ -1534,7 +1534,7 @@ void clusterCommand(redisClient *c) {
             if (server.cluster->slots[slot] == server.cluster->myself &&
                 n != server.cluster->myself)
             {
-                if (CountKeysInSlot(slot) != 0) {
+                if (countKeysInSlot(slot) != 0) {
                     addReplyErrorFormat(c, "Can't assign hashslot %d to a different node while I still hold keys for this hash slot.", slot);
                     return;
                 }
@@ -1619,7 +1619,7 @@ void clusterCommand(redisClient *c) {
         }
 
         keys = zmalloc(sizeof(robj*)*maxkeys);
-        numkeys = GetKeysInSlot(slot, keys, maxkeys);
+        numkeys = getKeysInSlot(slot, keys, maxkeys);
         addReplyMultiBulkLen(c,numkeys);
         for (j = 0; j < numkeys; j++) addReplyBulk(c,keys[j]);
         zfree(keys);

src/db.c

@@ -763,7 +763,7 @@ void slotToKeyFlush(void) {
     server.cluster->slots_to_keys = zslCreate();
 }
 
-unsigned int GetKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count) {
+unsigned int getKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count) {
     zskiplistNode *n;
     zrangespec range;
     int j = 0;
@@ -779,7 +779,7 @@ unsigned int GetKeysInSlot(unsigned int hashslot, robj **keys, unsigned int coun
     return j;
 }
 
-unsigned int CountKeysInSlot(unsigned int hashslot) {
+unsigned int countKeysInSlot(unsigned int hashslot) {
     zskiplistNode *n;
     zrangespec range;
     int j = 0;

src/redis.h

@@ -1226,8 +1226,8 @@ long long emptyDb();
 int selectDb(redisClient *c, int id);
 void signalModifiedKey(redisDb *db, robj *key);
 void signalFlushedDb(int dbid);
-unsigned int GetKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count);
-unsigned int CountKeysInSlot(unsigned int hashslot);
+unsigned int getKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count);
+unsigned int countKeysInSlot(unsigned int hashslot);
 int verifyClusterConfigWithData(void);
 
 /* API to get key arguments from commands */