BaseTools/VolInfo: Fix file handles not being closed

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/C/VolInfo/VolInfo.c

@@ -2191,6 +2191,7 @@ Returns:
     //
     GPtr = malloc (sizeof (GUID_TO_BASENAME));
     if (GPtr == NULL) {
+      fclose (Fptr);
       return EFI_OUT_OF_RESOURCES;
     }