digilent: free device enumeration after Detect

DmgrEnumDevices builds an internal device table that must be released
with DmgrFreeDvcEnum, otherwise a second enumeration (e.g. opening a
probe by index, which re-runs Detect) fails.

modules/drivers/digilent_jtag/digilent_jtag_drv.c

@@ -45,6 +45,7 @@ typedef struct dj_dvc {
 #pragma pack(pop)
 
 typedef DJ_BOOL (*pfn_DmgrEnumDevices)(int *pcdvc);
+typedef DJ_BOOL (*pfn_DmgrFreeDvcEnum)(void);
 typedef DJ_BOOL (*pfn_DmgrGetDvc)(int idvc, DJ_DVC *pdvc);
 typedef DJ_BOOL (*pfn_DmgrOpen)(DJ_HIF *phif, char *szSel);
 typedef DJ_BOOL (*pfn_DmgrClose)(DJ_HIF hif);
@@ -59,6 +60,7 @@ static struct {
     void *libmgr;
     void *libjtg;
     pfn_DmgrEnumDevices    EnumDevices;
+    pfn_DmgrFreeDvcEnum    FreeDvcEnum;
     pfn_DmgrGetDvc         GetDvc;
     pfn_DmgrOpen           Open;
     pfn_DmgrClose          Close;
@@ -120,6 +122,7 @@ static int digilent_load(jtag_core *jc)
     } while (0)
 
     RESOLVE(EnumDevices,    libmgr, DmgrEnumDevices);
+    RESOLVE(FreeDvcEnum,    libmgr, DmgrFreeDvcEnum);
     RESOLVE(GetDvc,         libmgr, DmgrGetDvc);
     RESOLVE(Open,           libmgr, DmgrOpen);
     RESOLVE(Close,          libmgr, DmgrClose);
@@ -194,6 +197,10 @@ static int drv_Digilent_Detect(jtag_core *jc)
         subdrv_list[i].sub_drv_id = i;
     }
 
+    /* Release the enumeration table — required before EnumDevices can be
+     * called again (e.g. a second jtag_get_probes_list / open by index). */
+    g_dj.FreeDvcEnum();
+
     g_dj_num_probes = cdvc;
     jtagcore_logs_printf(jc, MSG_INFO_1,
         "drv_Digilent_Detect : %d device(s) found\r\n", cdvc);