BaseTools/Scripts/GetMaintainer: Fix logic bug collecting maintainers

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4593

Fix logic bug where maintainers is incorrectly added to lists.

Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Rebecca Cran <rebecca@bsdio.com>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>

BaseTools/Scripts/GetMaintainer.py

@@ -88,7 +88,7 @@ def get_section_maintainers(path, section):
             if isinstance(address, list):
                 maintainers += address
             else:
-                lists += [address]
+                maintainers += [address]
         for address in section['list']:
             # Convert to list if necessary
             if isinstance(address, list):