remove useless "extern" keywords in headers

[musl] / include / errno.h

diff --git a/include/errno.h b/include/errno.h
index 9d68033..9e1e320 100644 (file)
--- a/include/errno.h
+++ b/include/errno.h
@@ -10,7 +10,7 @@ extern "C" {
 #ifdef __GNUC__
 __attribute__((const))
 #endif
-extern int *__errno_location(void);
+int *__errno_location(void);
 #define errno (*__errno_location())
 
 #ifdef __cplusplus