kernel/team: Remove team_get_team_struct, add team_geteuid.

Thanks to Axel for the review.

src/system/kernel/debug/user_debugger.cpp

@@ -2859,13 +2859,8 @@ _user_install_default_debugger(port_id debuggerPort)
 port_id
 _user_install_team_debugger(team_id teamID, port_id debuggerPort)
 {
-	if (geteuid() != 0) {
-		Team* team = team_get_team_struct(teamID);
-		if (team == NULL)
-			return B_BAD_VALUE;
-		if (team->effective_uid != geteuid())
-			return B_PERMISSION_DENIED;
-	}
+	if (geteuid() != 0 && team_geteuid(teamID) != geteuid())
+		return B_PERMISSION_DENIED;
 
 	return install_team_debugger(teamID, debuggerPort, -1, false, false);
 }

src/system/kernel/team.cpp

@@ -2918,15 +2918,8 @@ team_is_valid(team_id id)
 	if (id <= 0)
 		return false;
 
-	return team_get_team_struct(id) != NULL;
-}
-
-
-Team*
-team_get_team_struct(team_id id)
-{
 	InterruptsReadSpinLocker teamsLocker(sTeamHashLock);
-	return team_get_team_struct_locked(id);
+	return team_get_team_struct_locked(id) != NULL;
 }
 
 
@@ -3021,6 +3014,17 @@ team_set_foreground_process_group(int32 ttyIndex, pid_t processGroupID)
 }
 
 
+uid_t
+team_geteuid(team_id id)
+{
+	InterruptsReadSpinLocker teamsLocker(sTeamHashLock);
+	Team* team = team_get_team_struct_locked(id);
+	if (team == NULL)
+		return (uid_t)-1;
+	return team->effective_uid;
+}
+
+
 /*!	Removes the specified team from the global team hash, from its process
 	group, and from its parent.
 	It also moves all of its children to the kernel team.