[PATCH] add missing #include

There's a subtle problem with "inline" usage in <linux/string.h>:

 <linux/string.h>:
        this pulls in __constant_c_and_count_memset()

 <linux/mm.h>:
        this pulls <compiler.h>, re-defining
        inline == __inline__ __attribute__((always_inline)).

 But by now it is too late! The compiler has already seen the bare
 "inline" in string.h, and hasn't inlined it.

Result:

	# grep __constant System.map
	c0144670 t __constant_c_and_count_memset
	c0145c60 t __constant_c_and_count_memset
	... many more copies of this function ...

Fixed by including <compiler.h> early enough.

include/linux/string.h

@@ -5,6 +5,7 @@
 
 #ifdef __KERNEL__
 
+#include <linux/compiler.h>	/* for inline */
 #include <linux/types.h>	/* for size_t */
 #include <linux/stddef.h>	/* for NULL */