[MIPS] "extern inline" -> "static inline"

"extern inline" will have different semantics with gcc 4.3, and
"static inline" is correct here.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/processor.h b/include/asm-mips/processor.h
index 5f80ba7..3a466dc 100644
--- a/include/asm-mips/processor.h
+++ b/include/asm-mips/processor.h
@@ -237,7 +237,7 @@
 
 #define ARCH_HAS_PREFETCH
 
-extern inline void prefetch(const void *addr)
+static inline void prefetch(const void *addr)
 {
 	__asm__ __volatile__(
 	"	.set	mips4		\n"