Status pointer passed by caller is always non-NULL

in createTrack, openRecord, createEffect, createTrack_l,
createRecordTrack_l, and createEffect_l.

Change-Id: I2e459e4de9c78145f4d496e6abf289479a2f0941
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 46697e7..2c6d3d9 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -537,9 +537,7 @@
     }
 
 Exit:
-    if (status != NULL) {
-        *status = lStatus;
-    }
+    *status = lStatus;
     return trackHandle;
 }
 
@@ -1276,9 +1274,7 @@
     lStatus = NO_ERROR;
 
 Exit:
-    if (status) {
-        *status = lStatus;
-    }
+    *status = lStatus;
     return recordHandle;
 }
 
@@ -2211,9 +2207,7 @@
     }
 
 Exit:
-    if (status != NULL) {
-        *status = lStatus;
-    }
+    *status = lStatus;
     return handle;
 }