Remove all checkpatch errors from codebase

Exclude stdlib files because they do not follow kernel code style.

Fixes ARM-software/tf-issues#73

Change-Id: I4cfafa38ab436f5ab22c277cb38f884346a267ab
diff --git a/include/bl31/bl31.h b/include/bl31/bl31.h
index 33e4ece..96867b0 100644
--- a/include/bl31/bl31.h
+++ b/include/bl31/bl31.h
@@ -40,7 +40,7 @@
 void bl31_next_el_arch_setup(uint32_t security_state);
 void bl31_set_next_image_type(uint32_t type);
 uint32_t bl31_get_next_image_type(void);
-void bl31_prepare_next_image_entry();
+void bl31_prepare_next_image_entry(void);
 void bl31_register_bl32_init(int32_t (*)(void));
 
 #endif /* __BL31_H__ */