Fix couple of return types

src/OpenSSL.jl

@@ -42,6 +42,7 @@ import Base.close
 function close(client::SSLClient)
     closed = do_ssl_shutdown(client)
     close(client.sock)
+    free(client.context)
     free(client)
 end
 

src/bio.jl

@@ -21,7 +21,7 @@ bio_new() = bio_new(s_mem())
 function set_bio!(client::SSLClient, rbio, wbio)
     client.rbio = rbio
     client.wbio = wbio
-    ccall((:SSL_set_bio, libssl), Ptr{Cvoid}, (Ptr{Cvoid},Ptr{Cvoid},Ptr{Cvoid}),
+    ccall((:SSL_set_bio, libssl), Cvoid, (Ptr{Cvoid},Ptr{Cvoid},Ptr{Cvoid}),
           client.ssl, rbio, wbio)
 end
 

src/context.jl

@@ -1,5 +1,5 @@
 function set_options!(ctx::SSLContext, options::UInt32)
-    ccall((:SSL_CTX_set_options, libssl), Ptr{Cvoid}, (Ptr{Cvoid}, Clong),
+    ccall((:SSL_CTX_set_options, libssl), Clong, (Ptr{Cvoid}, Clong),
           ctx.ptr, options)
     nothing
 end