Remove redundant return statements

Change-Id: I4a163b97752f2f3eff10cf5dcad5e8f3484d7807
diff --git a/aom_dsp/x86/intrapred_avx2.c b/aom_dsp/x86/intrapred_avx2.c
index 85f7ddf..a406db9 100644
--- a/aom_dsp/x86/intrapred_avx2.c
+++ b/aom_dsp/x86/intrapred_avx2.c
@@ -2486,7 +2486,6 @@
       }
       break;
   }
-  return;
 }
 
 static void highbd_transpose(const uint16_t *src, ptrdiff_t pitchSrc,
@@ -4636,5 +4635,4 @@
       }
     }
   }
-  return;
 }
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 2452bc6..1f46b46 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -9160,7 +9160,6 @@
       nb_mi->interp_filters != current_mi->interp_filters) {
     ctxt->mv_field_check_result = 0;
   }
-  return;
 }
 
 // Check if the neighbors' motions used by obmc have same parameters as for