Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/atm/firestream.c b/drivers/atm/firestream.c
index 049650d..ef7a658 100644
--- a/drivers/atm/firestream.c
+++ b/drivers/atm/firestream.c
@@ -1782,7 +1782,7 @@
 		write_fs (dev, RAS0, RAS0_DCD_XHLT 
 			  | (((1 << FS155_VPI_BITS) - 1) * RAS0_VPSEL)
 			  | (((1 << FS155_VCI_BITS) - 1) * RAS0_VCSEL));
-		/* We can chose the split arbitarily. We might be able to 
+		/* We can chose the split arbitrarily. We might be able to 
 		   support more. Whatever. This should do for now. */
 		dev->atm_dev->ci_range.vpi_bits = FS155_VPI_BITS;
 		dev->atm_dev->ci_range.vci_bits = FS155_VCI_BITS;