excess space caused "../scripts/mysql_create_system_tables: line 46: : command not found"

when I ran mysql-test-run

scripts/mysql_create_system_tables.sh

@@ -43,7 +43,7 @@ c_tzn="" c_tz="" c_tzt="" c_tztt="" c_tzls="" c_pl=""
 i_tzn="" i_tz="" i_tzt="" i_tztt="" i_tzls="" i_pl=""
 c_p="" c_pp=""
 c_gl="" c_sl=""
-c_ev= ""
+c_ev=""
 
 # Check for old tables
 if test ! -f $mdata/db.frm