Remove stray empty line.

Originally committed as revision 22864 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/eval.h

@@ -61,7 +61,6 @@ double ff_parse_and_eval_expr(const char *s, const double *const_value, const ch
  * @return AVExpr which must be freed with ff_free_expr() by the user when it is not needed anymore
  *         NULL if anything went wrong
  */
-
 AVExpr *ff_parse_expr(const char *s, const char * const *const_name,
                double (* const *func1)(void *, double), const char * const *func1_name,
                double (* const *func2)(void *, double, double), const char * const *func2_name,