Code cleanup and ifdefs required for qurt build

Code that was previously out of tree that was #if 0, is now #ifdef __PX4_QURT.
These changes were required for flight using the qurt build.

Changes include code cleanup for shmem_posix.c.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/systemlib/param/param_shmem.c

@@ -72,11 +72,7 @@
 
 #include "shmem.h"
 
-#if 0
-# define debug(fmt, args...)		do { warnx(fmt, ##args); } while(0)
-#else
-# define debug(fmt, args...)		do { } while(0)
-#endif
+#define debug(fmt, args...)		do { } while(0)
 
 #define PARAM_OPEN	open
 #define PARAM_CLOSE	close
@@ -89,7 +85,7 @@ extern struct param_info_s	param_array[];
 extern struct param_info_s	*param_info_base;
 extern struct param_info_s	*param_info_limit;
 #else
-// FIXME - start and end are reversed
+// TODO: start and end are reversed
 static struct param_info_s *param_info_base = (struct param_info_s *) &px4_parameters;
 #endif
 
@@ -187,7 +183,7 @@ param_unlock(void)
 static void
 param_assert_locked(void)
 {
-	/* XXX */
+	/* TODO */
 }
 
 /**
@@ -196,7 +192,6 @@ param_assert_locked(void)
  * @param param			The parameter handle to test.
  * @return			True if the handle is valid.
  */
-//static bool
 bool
 handle_in_range(param_t param)
 {
@@ -241,19 +236,11 @@ param_find_changed(param_t param)
 	param_assert_locked();
 
 	if (param_values != NULL) {
-#if 0	/* utarray_find requires bsearch, not available */
-		struct param_wbuf_s key;
-		key.param = param;
-		s = utarray_find(param_values, &key, param_compare_values);
-#else
-
 		while ((s = (struct param_wbuf_s *)utarray_next(param_values, s)) != NULL) {
 			if (s->param == param) {
 				break;
 			}
 		}
-
-#endif
 	}
 
 	return s;
@@ -282,7 +269,6 @@ param_find_internal(const char *name, bool notification)
 	param_t param;
 
 	/* perform a linear search of the known parameters */
-
 	for (param = 0; handle_in_range(param); param++) {
 		if (!strcmp(param_info_base[param].name, name)) {
 			if (notification) {