[POWERPC] mpic_pasemi_msi: Failed allocation unnoticed
bitmap_find_free_region(), called by mpic_msi_alloc_hwirqs() may return signed, but hwirq is unsigned. A failed allocation remains unnoticed. Signed-off-by: NRoel Kluin <12o3l@tiscali.nl> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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