Fix compiler warnings.

This should fix everything but the platform_get_snd_device_name_extn
warnings which will be in a separate CL.

Change-Id: Iace30af1cb7754e0bcfd25de8dc55c2c059e30c6
Test: Still compiles.
diff --git a/post_proc/equalizer.c b/post_proc/equalizer.c
index 7cff348..1525226 100644
--- a/post_proc/equalizer.c
+++ b/post_proc/equalizer.c
@@ -183,7 +183,7 @@
 
 int equalizer_get_num_presets(equalizer_context_t *context __unused)
 {
-    ALOGV("%s: presets_num: %d", __func__,
+    ALOGV("%s: presets_num: %zu", __func__,
            sizeof(equalizer_preset_names)/sizeof(char *));
     return sizeof(equalizer_preset_names)/sizeof(char *);
 }