sparc: explicitly cast negative phandle checks to s32
When we switched sparc from using 'int's to 'phandle's (which is a u32), we neglected to do anything with the various checks for -1. For those tests, explicitly cast the phandles to s32. Signed-off-by: NAndres Salomon <dilinger@queued.net> Acked-by: NDavid S. Miller <davem@davemloft.net> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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