graphics_utils: check for valid framebuffer before creating a screen
Otherwise we crash later when we try to print on that screen.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent 8331fc5 commit 92327f1f6e57962b75e525eb34e11dfa03191332
@Sascha Hauer Sascha Hauer authored on 13 Nov 2015
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lib/gui/graphic_utils.c