Initialize struct values to 0 based on docs

The docs for AudioComponentDescription say that componentFlags and
componentFlagsMask must be set to 0 unless specific values are
requested.

Different platforms (32 vs 64 bit) initialize data to different starting
values. Ensure the AudioComponentDescription is initialized to prevent
unwanted side effects.

EZAudio/EZMicrophone.m

@@ -217,6 +217,9 @@ - (void)setup
 #elif TARGET_OS_MAC
     inputComponentDescription.componentSubType = kAudioUnitSubType_HALOutput;
 #endif
+    // The following must be set to zero unless a specific value is requested.
+    inputComponentDescription.componentFlags = 0;
+    inputComponentDescription.componentFlagsMask = 0;
 
     // get the first matching component
     AudioComponent inputComponent = AudioComponentFindNext( NULL , &inputComponentDescription);