hal: Fixes for the issues reported by KlocWork

-Fixes for KW issues reported which may cause NULL dereference:
283559, 293531, 293533, 309145

Change-Id: Ic0a1e891ba7a013ed48f1e5c82d4051f8e8b5a9d

hal/audio_extn/utils.c

@@ -186,6 +186,9 @@ static void parse_sample_rate_names(char *name, struct streams_output_cfg *so_in
         ALOGV("%s: sample_rate - %d", __func__, sample_rate);
         if (0 != sample_rate) {
             ss_info = (struct stream_sample_rate *)calloc(1, sizeof(struct stream_sample_rate));
+            if (ss_info == NULL)
+                break; /* return whatever was parsed */
+
             ss_info->sample_rate = sample_rate;
             list_add_tail(&so_info->sample_rate_list, &ss_info->list);
         }

hal/msm8916/hw_info.c

@@ -226,6 +226,10 @@ void *hw_info_init(const char *snd_card_name)
     struct hardware_info *hw_info;
 
     hw_info = malloc(sizeof(struct hardware_info));
+    if (!hw_info) {
+        ALOGE("failed to allocate mem for hardware info");
+        return NULL;
+    }
 
     if (strstr(snd_card_name, "msm8x16") || strstr(snd_card_name, "msm8939") ||
         strstr(snd_card_name, "msm8909")) {

hal/msm8916/platform.c

@@ -694,6 +694,10 @@ void platform_set_echo_reference(void *platform, bool enable)
 static struct csd_data *open_csd_client()
 {
     struct csd_data *csd = calloc(1, sizeof(struct csd_data));
+    if (!csd) {
+        ALOGE("failed to allocate csd_data mem");
+        return NULL;
+    }
 
     csd->csd_client = dlopen(LIB_CSD_CLIENT, RTLD_NOW);
     if (csd->csd_client == NULL) {
@@ -961,6 +965,10 @@ void *platform_init(struct audio_device *adev)
     char *cvd_version = NULL;
 
     my_data = calloc(1, sizeof(struct platform_data));
+    if (!my_data) {
+        ALOGE("failed to allocate platform data");
+        return NULL;
+    }
 
     while (snd_card_num < MAX_SND_CARD) {
         adev->mixer = mixer_open(snd_card_num);