Add rwlockInit (#155)

nx/include/switch/kernel/rwlock.h

@@ -14,6 +14,12 @@ typedef struct {
     u64 b;
 } RwLock;
 
+/**
+ * @brief Initializes the read/write lock.
+ * @param r Read/write lock object.
+ */
+void rwlockInit(RwLock* r);
+
 /**
  * @brief Locks the read/write lock for reading.
  * @param r Read/write lock object.

nx/source/kernel/rwlock.c

@@ -2,6 +2,12 @@
 #include "kernel/mutex.h"
 #include "kernel/rwlock.h"
 
+void rwlockInit(RwLock* r) {
+    rmutexInit(&r->r);
+    rmutexInit(&r->g);
+    r->b = 0;
+}
+
 void rwlockReadLock(RwLock* r) {
     rmutexLock(&r->r);