[PATCH 4.4 45/78] irda: vlsi_ir: fix check for DMA mapping errors

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Alexey Khoroshilov [ Upstream commit 6ac3b77a67513ff86b684aa256ea01c0e5b5 ] vlsi_alloc_ring() checks for DMA mapping errors by comparing returned address with zero,

[PATCH 4.4 45/78] irda: vlsi_ir: fix check for DMA mapping errors

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Alexey Khoroshilov [ Upstream commit 6ac3b77a67513ff86b684aa256ea01c0e5b5 ] vlsi_alloc_ring() checks for DMA mapping errors by comparing returned address with zero, while