cstyle: Resolve C style issues

The vast majority of these changes are in Linux specific code.
They are the result of not having an automated style checker to
validate the code when it was originally written.  Others were
caused when the common code was slightly adjusted for Linux.

This patch contains no functional changes.  It only refreshes
the code to conform to style guide.

Everyone submitting patches for inclusion upstream should now
run 'make checkstyle' and resolve any warning prior to opening
a pull request.  The automated builders have been updated to
fail a build if when 'make checkstyle' detects an issue.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1821

lib/libspl/include/rpc/types.h

@@ -24,7 +24,7 @@
  */
 
 #ifndef LIBSPL_RPC_TYPES_H
-#define LIBSPL_RPC_TYPES_H
+#define	LIBSPL_RPC_TYPES_H
 
 #include_next <rpc/types.h>
 #include <sys/kmem.h>

lib/libspl/include/rpc/xdr.h

@@ -30,7 +30,7 @@
  */
 
 #ifndef LIBSPL_RPC_XDR_H
-#define LIBSPL_RPC_XDR_H
+#define	LIBSPL_RPC_XDR_H
 
 #include_next <rpc/xdr.h>
 
@@ -55,10 +55,10 @@ typedef struct xdr_bytesrec {
  * XDR_RDMANOCHUNK - for xdr implementaion over RDMA, sets private flags in
  *                   the XDR stream moving over RDMA.
  */
-#define XDR_PEEK      2
-#define XDR_SKIPBYTES 3
-#define XDR_RDMAGET   4
-#define XDR_RDMASET   5
+#define	XDR_PEEK	2
+#define	XDR_SKIPBYTES	3
+#define	XDR_RDMAGET	4
+#define	XDR_RDMASET	5
 
 extern bool_t xdr_control(XDR *xdrs, int request, void *info);