Fix build warnings in aer.h

From: Mike Qiu <[email protected]>

build log:

In file included from include/ras/ras_event.h:11:0,

                 from drivers/ras/ras.c:13:

include/linux/aer.h:42:129: warning: ‘struct pci_dev’ declared inside parameter list [enabled by default]

include/linux/aer.h:42:129: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]

include/linux/aer.h:46:130: warning: ‘struct pci_dev’ declared inside parameter list [enabled by default]

include/linux/aer.h:50:136: warning: ‘struct pci_dev’ declared inside parameter list [enabled by default]

include/linux/aer.h:57:14: warning: ‘struct pci_dev’ declared inside parameter list [enabled by default]

---
 include/linux/aer.h | 2 ++
 1 file changed, 2 insertions(+)

Peter: Can you add this to the x86/ras branch in the tip tree. There's a change in there that is breaking randconfig builds in linux-next because something includes aer.h without including pci.h ... which ought to be legal as aer.h needs to take responsibility for making sure that it resolves dependencies itself.

index 4dbaa70..c826d1c 100644
@@ -11,6 +11,8 @@
 #define AER_FATAL			1
 #define AER_CORRECTABLE			2
 
+struct pci_dev;
+
 struct aer_header_log_regs {
 	unsigned int dw0;
 	unsigned int dw1;

1.8.1.4

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