uaudio: simplify free() usage

[Michael W. Bombardieri]

Hello,

A few NULL checks before free() can be removed in uaudio.
Immediately freeing the value returned by uaudio_io_terminaltype()
seems a little strange but I didn't look into that further.

- Michael


Index: uaudio.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/uaudio.c,v
retrieving revision 1.129
diff -u -p -u -r1.129 uaudio.c
--- uaudio.c    7 Jul 2018 13:03:08 -0000       1.129
+++ uaudio.c    23 Jul 2018 06:29:46 -0000
@@ -1353,8 +1353,7 @@ uaudio_io_terminaltype(int outtype, stru
                it->output = tml;
                if (it->inputs != NULL) {
                        for (i = 0; i < it->inputs_size; i++)
-                               if (it->inputs[i] != NULL)
-                                       free(it->inputs[i], M_TEMP, 0);
+                               free(it->inputs[i], M_TEMP, 0);
                        free(it->inputs, M_TEMP, 0);
                }
                it->inputs_size = 0;
@@ -1874,8 +1873,7 @@ uaudio_identify_ac(struct uaudio_softc *
                        continue;
                pot = iot[i].d.ot;
                tml = uaudio_io_terminaltype(UGETW(pot->wTerminalType), iot, i);
-               if (tml != NULL)
-                       free(tml, M_TEMP, 0);
+               free(tml, M_TEMP, 0);
        }
 
 #ifdef UAUDIO_DEBUG
@@ -1988,14 +1986,11 @@ uaudio_identify_ac(struct uaudio_softc *
                if (iot[i].d.desc == NULL)
                        continue;
                if (iot[i].inputs != NULL) {
-                       for (j = 0; j < iot[i].inputs_size; j++) {
-                               if (iot[i].inputs[j] != NULL)
-                                       free(iot[i].inputs[j], M_TEMP, 0);
-                       }
+                       for (j = 0; j < iot[i].inputs_size; j++)
+                               free(iot[i].inputs[j], M_TEMP, 0);
                        free(iot[i].inputs, M_TEMP, 0);
                }
-               if (iot[i].output != NULL)
-                       free(iot[i].output, M_TEMP, 0);
+               free(iot[i].output, M_TEMP, 0);
                iot[i].d.desc = NULL;
        }
        free(iot, M_TEMP, 256 * sizeof(struct io_terminal));