sparc32: Don't twiddle PT_DTRACE in exec.

That bit isn't used on this platform.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/process.c

@@ -638,11 +638,6 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
 			  (char __user * __user *)regs->u_regs[base + UREG_I2],
 			  regs);
 	putname(filename);
-	if (error == 0) {
-		task_lock(current);
-		current->ptrace &= ~PT_DTRACE;
-		task_unlock(current);
-	}
 out:
 	return error;
 }