net: misc: Remove extern from function prototypes

There are a mix of function prototypes with and without extern
in the kernel sources.  Standardize on not using extern for
function prototypes.

Function prototypes don't need to be written with extern.
extern is assumed by the compiler.  Its use is as unnecessary as
using auto to declare automatic/local variables in a block.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/rds.h b/net/rds/rds.h
index ec1d731..48f8ffc 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -749,7 +749,7 @@
 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
 		    struct cmsghdr *cmsg);
 
-extern void __rds_put_mr_final(struct rds_mr *mr);
+void __rds_put_mr_final(struct rds_mr *mr);
 static inline void rds_mr_put(struct rds_mr *mr)
 {
 	if (atomic_dec_and_test(&mr->r_refcount))