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

include/sys/zfs_debug.h

@@ -75,7 +75,7 @@ extern int zfs_recover;
  * filtered based on the zfs_flags variable.
  */
 #else
-#define dprintf(...)                                                   \
+#define	dprintf(...)                                                   \
 	if (zfs_flags & ZFS_DEBUG_DPRINTF)                             \
 		__dprintf(__FILE__, __func__, __LINE__, __VA_ARGS__)
 
@@ -92,7 +92,7 @@ typedef struct zfs_dbgmsg {
 extern void zfs_dbgmsg_init(void);
 extern void zfs_dbgmsg_fini(void);
 #if defined(_KERNEL) && defined(__linux__)
-#define        zfs_dbgmsg(...) dprintf(__VA_ARGS__)
+#define	zfs_dbgmsg(...) dprintf(__VA_ARGS__)
 #else
 extern void zfs_dbgmsg(const char *fmt, ...);
 extern void zfs_dbgmsg_print(const char *tag);