libc: adjust brk(0) to return the existing break, and use it to initialize sbrk()
*** 35,41 **** */ ENTRY_NP(_brk_unlocked) SYSTRAP_RVAL1(brk) SYSCERROR ! RETC SET_SIZE(_brk_unlocked) --- 35,41 ---- */ ENTRY_NP(_brk_unlocked) SYSTRAP_RVAL1(brk) SYSCERROR ! RET SET_SIZE(_brk_unlocked)