[ARM] spelling fixes

Spelling fixes in arch/arm/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-ixp2000/pci.c b/arch/arm/mach-ixp2000/pci.c
index 5a09a90c..03f4cf7 100644
--- a/arch/arm/mach-ixp2000/pci.c
+++ b/arch/arm/mach-ixp2000/pci.c
@@ -102,7 +102,7 @@
 }
 
 /*
- * We don't do error checks by callling clear_master_aborts() b/c the
+ * We don't do error checks by calling clear_master_aborts() b/c the
  * assumption is that the caller did a read first to make sure a device
  * exists.
  */