[PATCH] skeletonfb: More corrections

From: Krzysztof Helt <redacted>

More corrections to skeletonfb.c file:
- fixed types of more arguments
- removed returned values in void functions
- removed not existing fb_poll function
- fixed closing comment typo
- corrected misleading constant name ADDR

Signed-off-by: Krzysztof Helt <redacted>

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This patch requires patches already sent to mm tree.

Somehow not all fixes went previously into my patch. Some of 
fixes correct changes in the last patch.

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