evas: fix png regression issue

evas: fix png regression issue

Summary:
Accidentally commit "382c580 evas: add support for .9.png file to PNG loader."
adding the 9 patch feature with small code refactoring made use of setjmp
incorrectly.

[Problem]
evas_image_load_file_data_png calls _evas_image_load_file_internal_head_png,
and _evas_image_load_file_internal_head_png calls setjmp and returns without
problem. And png_read_row calls longjmp. This causes jumping into a function
which was exited. Problematic png file will be attached.

[Solution]
Save calling environment i.e. call setjmp, after returning from
_evas_image_load_file_internal_head_png.

Test Plan:
Problematic png file
{F3876983}

And example code.
{F3876986}

Reviewers: Hermet, jsuya, herb

Reviewed By: Hermet

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D11782