quieten compile warnings

Sync with glibc, quietens gcc warnings.

libpthread/nptl/sysdeps/pthread/bits/libc-lock.h

@@ -171,7 +171,7 @@ typedef pthread_key_t __libc_key_t;
 /* Initialize the named lock variable, leaving it in a consistent, unlocked
    state.  */
 #if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
-# define __libc_lock_init(NAME) ((NAME) = LLL_LOCK_INITIALIZER, 0)
+# define __libc_lock_init(NAME) ((void)((NAME) = LLL_LOCK_INITIALIZER))
 #else
 # define __libc_lock_init(NAME) \
   __libc_maybe_call (__pthread_mutex_init, (&(NAME), NULL), 0)

libpthread/nptl/sysdeps/pthread/bits/stdio-lock.h

@@ -31,7 +31,7 @@ typedef struct { int lock; int cnt; void *owner; } _IO_lock_t;
 #define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL }
 
 #define _IO_lock_init(_name) \
-  ((_name) = (_IO_lock_t) _IO_lock_initializer , 0)
+  ((void) ((_name) = (_IO_lock_t) _IO_lock_initializer))
 
 #define _IO_lock_fini(_name) \
   ((void) 0)