avcodec EncodeVideo(): reduce indentation level

Also fix indentation (4 spaces)

modules/codec/avcodec/encoder.c

@@ -812,7 +812,6 @@ error:
 static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
 {
     encoder_sys_t *p_sys = p_enc->p_sys;
-    AVFrame frame;
     int i_out, i_plane;
 
     /* Initialize the video output buffer the first time.
@@ -834,8 +833,9 @@ static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
             return NULL;
     }
 
-    memset( &frame, 0, sizeof( AVFrame ) );
     if( likely(p_pict) ) {
+        AVFrame frame;
+        memset( &frame, 0, sizeof( AVFrame ) );
         for( i_plane = 0; i_plane < p_pict->i_planes; i_plane++ )
         {
             frame.data[i_plane] = p_pict->p[i_plane].p_pixels;
@@ -937,8 +937,9 @@ static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
                                      p_sys->i_buffer_out, NULL);
     }
 
-    if( i_out > 0 )
-    {
+    if( i_out <= 0 )
+        return NULL;
+
     block_t *p_block = block_New( p_enc, i_out );
     memcpy( p_block->p_buffer, p_sys->p_buffer_out, i_out );
 
@@ -1012,9 +1013,6 @@ static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pict )
     }
 
     return p_block;
-    }
-
-    return NULL;
 }
 
 /****************************************************************************