Sync with maint

* maint:
  Documentation: fix broken linkgit to git-config
  git-compat-util: st_add4: work around gcc 4.2.x compiler crash

Documentation/githooks.txt

@@ -397,7 +397,7 @@ preceding SP is also omitted.  Currently, no commands pass any
 'extra-info'.
 
 The hook always runs after the automatic note copying (see
-"notes.rewrite.<command>" in linkgit:git-config.txt[1]) has happened, and
+"notes.rewrite.<command>" in linkgit:git-config[1]) has happened, and
 thus has access to these notes.
 
 The following command-specific comments apply:

git-compat-util.h

@@ -715,8 +715,8 @@ static inline size_t st_add(size_t a, size_t b)
 		    (uintmax_t)a, (uintmax_t)b);
 	return a + b;
 }
-#define st_add3(a,b,c)   st_add((a),st_add((b),(c)))
-#define st_add4(a,b,c,d) st_add((a),st_add3((b),(c),(d)))
+#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
+#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 
 static inline size_t st_mult(size_t a, size_t b)
 {