audio: don't use 'Yoda conditions'

imitate nearby code about using '!value' or 'value == NULL'

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/audio/gus.c

@@ -212,7 +212,7 @@ static int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
         pos += copied;
     }
 
-    if (0 == ((mode >> 4) & 1)) {
+    if (((mode >> 4) & 1) == 0) {
         DMA_release_DREQ (s->emu.gusdma);
     }
     return dma_len;

hw/audio/hda-codec.c

@@ -489,8 +489,9 @@ static int hda_audio_init(HDACodecDevice *hda, const struct desc_codec *desc)
     for (i = 0; i < a->desc->nnodes; i++) {
         node = a->desc->nodes + i;
         param = hda_codec_find_param(node, AC_PAR_AUDIO_WIDGET_CAP);
-        if (NULL == param)
+        if (param == NULL) {
             continue;
+        }
         type = (param->val & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT;
         switch (type) {
         case AC_WID_AUD_OUT:

hw/audio/sb16.c

@@ -928,7 +928,7 @@ static IO_WRITE_PROTO (dsp_write)
 /*         if (s->highspeed) */
 /*             break; */
 
-        if (0 == s->needed_bytes) {
+        if (s->needed_bytes == 0) {
             command (s, val);
 #if 0
             if (0 == s->needed_bytes) {
@@ -1212,7 +1212,7 @@ static int SB_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
 #endif
 
     if (till <= copy) {
-        if (0 == s->dma_auto) {
+        if (s->dma_auto == 0) {
             copy = till;
         }
     }
@@ -1224,7 +1224,7 @@ static int SB_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
     if (s->left_till_irq <= 0) {
         s->mixer_regs[0x82] |= (nchan & 4) ? 2 : 1;
         qemu_irq_raise (s->pic);
-        if (0 == s->dma_auto) {
+        if (s->dma_auto == 0) {
             control (s, 0);
             speaker (s, 0);
         }