Fix const-related compiler errors

async.c

@@ -62,8 +62,8 @@ void __redisAppendCommand(redisContext *c, char *cmd, size_t len);
 
 /* Functions managing dictionary of callbacks for pub/sub. */
 static unsigned int callbackHash(const void *key) {
-    return dictGenHashFunction((const unsigned char*)key
-                               , sdslen((const char*)key));
+    return dictGenHashFunction((const unsigned char *)key,
+                               sdslen((const sds)key));
 }
 
 static void *callbackValDup(void *privdata, const void *src) {
@@ -74,11 +74,11 @@ static void *callbackValDup(void *privdata, const void *src) {
 }
 
 static int callbackKeyCompare(void *privdata, const void *key1, const void *key2) {
-    const int l1, l2;
+    int l1, l2;
     ((void) privdata);
 
-    l1 = sdslen((sds)key1);
-    l2 = sdslen((sds)key2);
+    l1 = sdslen((const sds)key1);
+    l2 = sdslen((const sds)key2);
     if (l1 != l2) return 0;
     return memcmp(key1,key2,l1) == 0;
 }

hiredis.c

@@ -665,7 +665,7 @@ int redisReaderGetReply(redisReader *r, void **reply) {
 }
 
 /* Calculate the number of bytes needed to represent an integer as string. */
-static const int intlen(int i) {
+static int intlen(int i) {
     int len = 0;
     if (i < 0) {
         len++;
@@ -679,7 +679,7 @@ static const int intlen(int i) {
 }
 
 /* Helper that calculates the bulk length given a certain string length. */
-static const size_t bulklen(size_t len) {
+static size_t bulklen(size_t len) {
     return 1+intlen(len)+2+len+2;
 }