credentials: unconfuse Go about the type

For some reason cgo thinks the `credtype` field does not exist in `git_cred` so
let's put it into the C code.

1 files changed, 3 insertions, 1 deletions

diff --git a/credentials.go b/credentials.go
index 766619c..038313b 100644
--- a/credentials.go
+++ b/credentials.go
@@ -3,6 +3,8 @@ package git
 /*
 #include <git2.h>
 #include <git2/sys/cred.h>
+
+git_credtype_t _go_git_cred_credtype(git_cred *cred);
 */
 import "C"
 import "unsafe"
@@ -28,7 +30,7 @@ func (o *Cred) HasUsername() bool {
 }
 
 func (o *Cred) Type() CredType {
-	return (CredType)(o.ptr.credtype)
+	return (CredType)(C._go_git_cred_credtype(o.ptr))
 }
 
 func credFromC(ptr *C.git_cred) *Cred {