malloc returns void*; must be cast to real ptr type

Change-Id: Ic19707b99b1a53005ac319887219fc52b3e60e89

sal/osl/unx/mutex.c

@@ -42,7 +42,7 @@ typedef struct _oslMutexImpl
 /*****************************************************************************/
 oslMutex SAL_CALL osl_createMutex()
 {
-    oslMutexImpl* pMutex = malloc(sizeof(oslMutexImpl));
+    oslMutexImpl* pMutex = (oslMutexImpl*) malloc(sizeof(oslMutexImpl));
     pthread_mutexattr_t aMutexAttr;
     int nRet=0;