Remove UNUSED() macro, just use -Wno-unused instead

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

README.md

@@ -143,10 +143,6 @@ Helper Macros
   Returns the number of elements in an array.  From the great book, The
   Practice of Programming, by Kernighan and Pike.
 
-- `UNUSED(var)`
-
-  Shorter and more readable version of `var __attribute__ ((unused))`
-
 
 Generic Functions
 -----------------

lite.h

@@ -156,11 +156,6 @@ static inline int erase(const char *path)
 #define NELEMS(array) (sizeof(array) / sizeof(array[0]))
 #endif
 
-/* Mark a function variable as unused, useful for generic callbacks */
-#ifndef UNUSED
-#define UNUSED(x) UNUSED_ ## x __attribute__ ((unused))
-#endif
-
 /* Does directory end with a slash? */
 static inline int fisslashdir(char *dir)
 {

tests/pidfile.c

@@ -15,13 +15,13 @@ static char PIDFILE[42];
 static int verbose = 0;
 static struct stat before, after;
 
-static void sigterm_handler(int UNUSED(signo))
+static void sigterm_handler(int signo)
 {
 	PRINT("Exiting ...\n");
 	remove(PIDFILE);
 }
 
-static void sigalrm_handler(int UNUSED(signo))
+static void sigalrm_handler(int signo)
 {
 	PRINT("Calling pidfile(%s)\n", pidfile_arg ?: "NULL");
 	if (pidfile(pidfile_arg))