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>
diff --git a/arch/mips/kernel/module.c b/arch/mips/kernel/module.c
index cb08014..e7ed0ac 100644
--- a/arch/mips/kernel/module.c
+++ b/arch/mips/kernel/module.c
@@ -381,7 +381,7 @@
 	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)