Switch to Linux kernel coding style

Convert our code base to adhere to Linux kernel coding style using
Lindent, with the following exceptions:

* Use spaces, instead of tabs, for indentation.
* Use 2-character indentations (instead of 8 characters).

Rationale: We currently have too much levels of indentation. Using
8-character tabs would make huge code parts unreadable. These need to be
cleaned up before we can switch to 8 characters.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/htable.h

@@ -69,7 +69,7 @@ struct name {                                                                 \
 }
 
 #define HTABLE_ENTRY(type)                                                    \
-struct type   *next          /* To build the bucket chain list. */
+struct type   *next             /* To build the bucket chain list. */
 
 #define HTABLE_SIZE(head)                                                     \
   (sizeof (*(head)->bkts) ? sizeof ((head)->bkts) / sizeof (*(head)->bkts) : 0)