Remove condition that could cause aliasing and fix typo

theano/scan_module/scan_opt.py

@@ -1228,7 +1228,7 @@ class ScanSaveMem(gof.Optimizer):
                     if start == 0 or store_steps[i] == 0:
                         store_steps[i] = 0
                     else:
-                        # The "+ 1" is because if the memory pre-allocation
+                        # The "+ 1" is because of the memory pre-allocation
                         # mechanism used to in the Scan op to reduce overhead.
                         # To prevent aliasing between the inputs and outputs
                         # of recurrent states, it requires that the buffer be
@@ -1236,18 +1236,12 @@ class ScanSaveMem(gof.Optimizer):
                         # tap needed don't occupy the sample place in the
                         # circular buffer. For now, this only needs to be done
                         # for mitsots and sitsots (because mitmots are not
-                        # currently supported by the mechanism) and only if
-                        # the inner function has more then one output
-                        # (otherwise, there is no risk of aliasing because
-                        # once the output is computed, the oldest tap can
-                        # safely be overwritten).
+                        # currently supported by the mechanism).
                         first_mitsot_idx = node.op.n_mit_mot
                         last_sitsot_idx = (node.op.n_mit_mot +
                                            node.op.n_mit_sot +
                                            node.op.n_sit_sot - 1)
-                        if (i >= first_mitsot_idx and i <= last_sitsot_idx and
-                            len(node.op.outputs) > 1):
-
+                        if (i >= first_mitsot_idx and i <= last_sitsot_idx):
                             pval = select_max(nw_steps - start + init_l[i],
                                               init_l[i] + 1)
                         else: