Fix missing FTUNLOCK

Since we locked the font_draw mutex earlier, we should unlock it
before we return.

NB: Fixes Coverity CID1039382

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/lib/evas/common/evas_font_load.c

@@ -157,6 +157,7 @@ evas_common_font_source_memory_load(const char *name, const void *data, int data
    if (error)
      {
         FT_Done_Face(fs->ft.face);
+        FTUNLOCK();
         fs->ft.face = NULL;
         free(fs);
         return NULL;