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pam: close fd after use

--- a/pam.c

+++ b/pam.c

@@ -14,7 +14,6 @@

 #include "fncs.h"

-/* pasword change TODO */

 PAM_EXTERN int

 pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv )

 {

@@ -21,7 +20,6 @@

 	return PAM_SUCCESS;

 }

-/* For checking if the user has expired, has access to specific machine etc */

 PAM_EXTERN int

 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)

 {

@@ -30,7 +28,6 @@

 char *authserver;

-/* expected hook, this is where custom stuff happens */

 PAM_EXTERN int

 pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv )

 {

@@ -54,6 +51,8 @@

 		return PAM_AUTH_ERR;

 	ai = p9any(username, password, fd);

+	close(fd);

+

 	if(ai == nil)

 		return PAM_AUTH_ERR;