AGM: Add null pointer checks

Added some memory allocation checks.

Change-Id: Ibd3ef8d382066d6adfc9786fd53af071ab896638
diff --git a/plugins/tinyalsa/test/agm_voiceui.c b/plugins/tinyalsa/test/agm_voiceui.c
index f039be8..fe8ef90 100644
--- a/plugins/tinyalsa/test/agm_voiceui.c
+++ b/plugins/tinyalsa/test/agm_voiceui.c
@@ -25,7 +25,40 @@
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-**/
+**
+** Changes from Qualcomm Innovation Center are provided under the following license:
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+**
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+*/
 
 #include <errno.h>
 #include <tinyalsa/asoundlib.h>
@@ -75,6 +108,10 @@
     num_values = mixer_ctl_get_num_values(ctl);
     printf("%s - %d\n", __func__, num_values);
     buf = calloc(1, num_values);
+    if (!buf) {
+        printf("Failed to allocate memory for buffer\n");
+        return;
+    }
 
     ret = mixer_ctl_get_array(ctl, buf, num_values);
     if (ret < 0) {
@@ -215,6 +252,11 @@
     uint8_t *buf;
     uint32_t *module_instance_id = NULL;
 
+    if (!size || !temp) {
+        printf("Failed to allocate memory for size and temp\n");
+        return NULL;
+    }
+
     va_start(valist, num);
     for (i = 0; i < num; i++) {
         temp[i] = va_arg(valist, char *);