fixup! Do not mask the username when reading credentials

This fixes t0300 and t0302 which rely on GIT_ASKPASS to be respected
even when querying the username. And if those tests rely on that feature
we can be certain that other callers rely on it, too (think UIs).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

credential.c

@@ -132,6 +132,8 @@ static void credential_getpass(struct credential *c)
 {
 	if (!c->username)
 		c->username = credential_ask_one("Username", c,
+						 (getenv("GIT_ASKPASS") ?
+						  PROMPT_ASKPASS : 0) |
 						 PROMPT_ECHO);
 	if (!c->password)
 		c->password = credential_ask_one("Password", c,