[PATCH] tracing: silence noisy warnings about struct inode

[Randy Dunlap]

From: Randy Dunlap <rdun...@infradead.org>

Fix 30 warnings for missing "struct inode" declaration (like these) by
adding a forward reference for it.
These warnings come from 'headers_check' (CONFIG_HEADERS_CHECK):
  CC      include/trace/events/iomap.h.s

./../include/trace/events/iomap.h:49:18: warning: 'struct inode' declared 
inside parameter list will not be visible outside of this definition or 
declaration
./../include/trace/events/iomap.h:77:18: warning: 'struct inode' declared 
inside parameter list will not be visible outside of this definition or 
declaration

Signed-off-by: Randy Dunlap <rdun...@infradead.org>
Cc: Steven Rostedt <rost...@goodmis.org>
---
 include/trace/events/iomap.h |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20190829.orig/include/trace/events/iomap.h
+++ linux-next-20190829/include/trace/events/iomap.h
@@ -44,6 +44,8 @@ DECLARE_EVENT_CLASS(iomap_page_class,
                  __entry->length)
 )
 
+struct inode;
+
 #define DEFINE_PAGE_EVENT(name)                \
 DEFINE_EVENT(iomap_page_class, name,   \
        TP_PROTO(struct inode *inode, struct page *page, unsigned long off, \