Fix shortHashKeygen, which doesn't have a return value, but was defined as returing Int in JNA defintion

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/JnaLibsodiumInterface.kt

@@ -274,7 +274,7 @@ interface JnaLibsodiumInterface : Library {
     fun crypto_shorthash(out: ByteArray, input: ByteArray, inlen: Long, key: ByteArray): Int
 
     //    void crypto_shorthash_keygen(unsigned char k[crypto_shorthash_KEYBYTES])
-    fun crypto_shorthash_keygen(key: ByteArray): Int
+    fun crypto_shorthash_keygen(key: ByteArray)
 
 //
 // ---- Short hash end ----

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/shortinputhash/ShortHash.kt

@@ -20,7 +20,7 @@ actual object ShortHash {
 
     actual fun shortHashKeygen(): UByteArray {
         val key = UByteArray(crypto_shorthash_KEYBYTES)
-        sodiumJna.crypto_shorthash_keygen(key.asByteArray()).ensureLibsodiumSuccess()
+        sodiumJna.crypto_shorthash_keygen(key.asByteArray())
         return key
     }