Patch for libpciaccess 0.13.2 to "reference count" init/cleanup calls.

--- a/src/common_init.c	2014-09-14 03:17:38.628195344 +0400
+++ b/src/common_init.c	2014-09-14 03:19:31.402246351 +0400
@@ -36,6 +36,7 @@
 #include "pciaccess_private.h"
 
 _pci_hidden struct pci_system * pci_sys;
+static pci_sys_refcnt = 0;
 
 /**
  * Initialize the PCI subsystem for access.
@@ -52,6 +53,11 @@ pci_system_init( void )
 {
     int err = ENOSYS;
 
+    if ( pci_sys_refcnt > 0 ) {
+	pci_sys_refcnt++;
+	return 0;
+    }
+
 #ifdef linux
     err = pci_system_linux_sysfs_create();
 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
@@ -66,6 +72,10 @@ pci_system_init( void )
     err = pci_system_x86_create();
 #endif
 
+    if ( pci_sys ) {
+	pci_sys_refcnt = 1;
+    }
+
     return err;
 }
 
@@ -91,6 +101,9 @@ pci_system_cleanup( void )
 
     if ( pci_sys == NULL ) {
 	return;
+    } else if ( pci_sys_refcnt > 1 ) {
+	pci_sys_refcnt--;
+	return;
     }
 
     pci_io_cleanup();
@@ -123,4 +136,5 @@ pci_system_cleanup( void )
 
     free( pci_sys );
     pci_sys = NULL;
+    pci_sys_refcnt = 0;
 }