ARM: 8476/1: VDSO: use PTR_ERR_OR_ZERO for vma check
Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR Signed-off-by: NPrasanna Karthik <mkarthi3@visteon.com> Signed-off-by: NNathan Lynch <nathan_lynch@mentor.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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