mips: setup: fix setnocoherentio() boolean setting

Correct a typo/pasto: setnocoherentio() should set
dma_default_coherent to false, not true.

Fixes: 14ac09a ("MIPS: refactor the runtime coherent vs noncoherent DMA indicators")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: [email protected]
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

Author: rddunlap

arch/mips/kernel/setup.c

@@ -803,7 +803,7 @@ early_param("coherentio", setcoherentio);
 
 static int __init setnocoherentio(char *str)
 {
-	dma_default_coherent = true;
+	dma_default_coherent = false;
 	pr_info("Software DMA cache coherency (command line)\n");
 	return 0;
 }