Fix 'maybe used uninitialized' warning

Fix 'maybe used uninitialized' warning

Summary:
    bin/edje/edje_cc_out.c: In function ‘data_write_images’:
    bin/edje/edje_cc_out.c:1164:7: warning: ‘f’ may be used uninitialized in this function [-Wmaybe-uninitialized]
        if (!f) return EINA_FALSE;
           ^
    bin/edje/edje_cc_out.c:1154:15: note: ‘f’ was declared here
        Eina_File *f;
                   ^

Reviewers: cedric, jpeg

Reviewed By: jpeg

Subscribers: seoz, jpeg

Differential Revision: https://phab.enlightenment.org/D4101