scripts/gdb: Adjust module reference counter reported by lx-lsmod

This takes the MODULE_REF_BASE into account.

Link: http://lkml.kernel.org/r/d926d2d54caa034adb964b52215090cbdb875249.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/gdb/linux/modules.py

@@ -78,7 +78,7 @@ def invoke(self, arg, from_tty):
                 address=str(layout['base']).split()[0],
                 name=module['name'].string(),
                 size=str(layout['size']),
-                ref=str(module['refcnt']['counter'])))
+                ref=str(module['refcnt']['counter'] - 1)))
 
             source_list = module['source_list']
             t = self._module_use_type.get_type().pointer()