hal: Fix potential memory leaks in HAL

Fix potential memory leaks in HAL

Change-Id: Ifd491cc185a7d1afa647f03639e57d1685d18803
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index ae7853e..f8b9652 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -2148,7 +2148,7 @@
 {
     struct stream_out *out = (struct stream_out *)stream;
     struct str_parms *query = str_parms_create_str(keys);
-    char *str;
+    char *str = (char*) NULL;
     char value[256];
     struct str_parms *reply = str_parms_create();
     size_t i, j;
@@ -2156,6 +2156,12 @@
     bool first = true;
 
     if (!query || !reply) {
+        if (reply) {
+            str_parms_destroy(reply);
+        }
+        if (query) {
+            str_parms_destroy(query);
+        }
         ALOGE("out_get_parameters: failed to allocate mem for query or reply");
         return NULL;
     }
@@ -2201,6 +2207,8 @@
             strlcat(value, "false", sizeof(value));
         }
         str_parms_add_str(reply, "is_direct_pcm_track", value);
+        if (str)
+            free(str);
         str = str_parms_to_str(reply);
     }
 
@@ -2223,6 +2231,8 @@
             i++;
         }
         str_parms_add_str(reply, AUDIO_PARAMETER_STREAM_SUP_FORMATS, value);
+        if (str)
+            free(str);
         str = str_parms_to_str(reply);
     }
     str_parms_destroy(query);
@@ -2808,6 +2818,12 @@
     struct str_parms *reply = str_parms_create();
 
     if (!query || !reply) {
+        if (reply) {
+            str_parms_destroy(reply);
+        }
+        if (query) {
+            str_parms_destroy(query);
+        }
         ALOGE("in_get_parameters: failed to create query or reply");
         return NULL;
     }
@@ -3528,6 +3544,12 @@
     int ret = 0;
 
     if (!query || !reply) {
+        if (reply) {
+            str_parms_destroy(reply);
+        }
+        if (query) {
+            str_parms_destroy(query);
+        }
         ALOGE("adev_get_parameters: failed to create query or reply");
         return NULL;
     }