erofs: remove unused trace event erofs_destroy_inode

The trace event `erofs_destroy_inode` was added but remains unused. This
unused event contributes approximately 5KB to the kernel module size.

Reported-by: Steven Rostedt <[e-mail]>
Closes: https://lore.kernel.org/r/[e-mail]
Fixes: 13f06f48f7bf ("staging: erofs: support tracepoint")
Cc: [e-mail]
Reviewed-by: Hongbo Li <[e-mail]>
Signed-off-by: Gao Xiang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

include/trace/events/erofs.h

···
 		  show_mflags(__entry->mflags), __entry->ret)
 );
 
-TRACE_EVENT(erofs_destroy_inode,
-	TP_PROTO(struct inode *inode),
-
-	TP_ARGS(inode),
-
-	TP_STRUCT__entry(
-		__field(	dev_t,		dev		)
-		__field(	erofs_nid_t,	nid		)
-	),
-
-	TP_fast_assign(
-		__entry->dev	= inode->i_sb->s_dev;
-		__entry->nid	= EROFS_I(inode)->nid;
-	),
-
-	TP_printk("dev = (%d,%d), nid = %llu", show_dev_nid(__entry))
-);
-
 #endif /* _TRACE_EROFS_H */
 
  /* This part must be outside protection */