UBIFS: get rid of dbg_dump_stack

In case of errors we almost always need the stack dump - it makes no sense
to compile it out. Remove the 'dbg_dump_stack()' function completely.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
diff --git a/fs/ubifs/debug.h b/fs/ubifs/debug.h
index 9f71765..6e5d345 100644
--- a/fs/ubifs/debug.h
+++ b/fs/ubifs/debug.h
@@ -149,7 +149,7 @@
 	if (unlikely(!(expr))) {                                               \
 		printk(KERN_CRIT "UBIFS assert failed in %s at %u (pid %d)\n", \
 		       __func__, __LINE__, current->pid);                      \
-		dbg_dump_stack();                                              \
+		dump_stack();                                                  \
 	}                                                                      \
 } while (0)
 
@@ -161,8 +161,6 @@
 	}                                                                      \
 } while (0)
 
-#define dbg_dump_stack() dump_stack()
-
 #define dbg_err(fmt, ...) do {                                                 \
 	ubifs_err(fmt, ##__VA_ARGS__);                                         \
 } while (0)
@@ -341,7 +339,6 @@
 		printk(KERN_DEBUG fmt "\n", ##__VA_ARGS__); \
 } while (0)
 
-#define dbg_dump_stack()
 #define ubifs_assert_cmt_locked(c)
 
 #define dbg_msg(fmt, ...)       ubifs_dbg_msg(fmt, ##__VA_ARGS__)