Fix misspellings of "system", "controller", "interrupt" and "necessary".

Fix the various misspellings of "system", controller", "interrupt" and
"[un]necessary".

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

arch/mips/kernel/module.c

@@ -381,7 +381,7 @@ const struct exception_table_entry *search_module_dbetables(unsigned long addr)
 	return e;
 }
 
-/* Put in dbe list if neccessary. */
+/* Put in dbe list if necessary. */
 int module_finalize(const Elf_Ehdr *hdr,
 		    const Elf_Shdr *sechdrs,
 		    struct module *me)

arch/mips/pci/pci-excite.c

@@ -131,7 +131,7 @@ static int __init basler_excite_pci_setup(void)
 		ocd_writel(0x00000000, bar + 0x100);
 	}
 
-	/* Finally, enable the PCI interupt */
+	/* Finally, enable the PCI interrupt */
 #if USB_IRQ > 7
 	set_c0_intcontrol(1 << USB_IRQ);
 #else

arch/mips/sni/pcimt.c

@@ -246,7 +246,7 @@ static void pcimt_hwint1(void)
 		/*
 		 * Note: ASIC PCI's builtin interrupt achknowledge feature is
 		 * broken.  Using it may result in loss of some or all i8259
-		 * interupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
+		 * interrupts, so don't use PCIMT_INT_ACKNOWLEDGE ...
 		 */
 		irq = i8259_irq();
 		if (unlikely(irq < 0))