[PATCH v4 1/2] asm-generic/bug.h: declare struct pt_regs; before function prototype

[Ian Abbott <abbotti@mev.co.uk>]

The declaration of `__warn()` has `struct pt_regs *regs` as one of its
parameters.  This can result in compiler warnings if `struct regs` is
not already declared.  Add an empty declaration of `struct pt_regs` to
avoid the warnings.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
v3: Actually, there was no v1 or v2.  I called this v3 to match the
series.
v4: Corrected 'Acked-by:' line in patch description.
---
 include/asm-generic/bug.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index d6f4aed479a1..87191357d303 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -97,6 +97,7 @@ extern void warn_slowpath_null(const char *file, const int line);
 
 /* used internally by panic.c */
 struct warn_args;
+struct pt_regs;
 
 void __warn(const char *file, int line, void *caller, unsigned taint,
 	    struct pt_regs *regs, struct warn_args *args);
-- 
2.11.0