powerpc/fsl_msi: fix error return code in fsl_of_msi_probe()
powerpc/fsl_msi: fix error return code in fsl_of_msi_probe()

Fix to return a negative error code in the MSI bitmap alloc error
handling case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <b8f9cab8be13de37b9588aedad10a20fc3a68783@trendmicro.com.cn>
Signed-off-by: Scott Wood <b77916c2feab81a70245e7b5671f4f02730ebf64@freescale.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs