Merge branch 'tg/memfixes'

Fixes for a handful memory access issues identified by valgrind.

* tg/memfixes:
  sub-process: use child_process.args instead of child_process.argv
  http-push: fix construction of hex value from path
  path.c: fix uninitialized memory access

http-push.c

@@ -1018,7 +1018,7 @@ static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
 	memcpy(hex, path, 2);
 	path += 2;
 	path++; /* skip '/' */
-	memcpy(hex, path, GIT_SHA1_HEXSZ - 2);
+	memcpy(hex + 2, path, GIT_SHA1_HEXSZ - 2);
 
 	return get_oid_hex(hex, oid);
 }