edksetup.sh: Fix typo and return code

The typo was a check for the string "BaseTool" instead of "BaseTools".

Also fixed the issue where the script returned success even when
configuration failed.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15200 6f19259b-4bc3-4df7-8a09-765794883524

edksetup.sh

@@ -30,6 +30,7 @@ function HelpMsg()
   echo Please note: This script must be \'sourced\' so the environment can be changed.
   echo ". edksetup.sh" 
   echo "source edksetup.sh"
+  return 1
 }
 
 function SetupEnv()
@@ -51,7 +52,6 @@ function SourceEnv()
      ]
   then
     HelpMsg
-    return
   else
     SetupEnv "$*"
   fi
@@ -60,11 +60,15 @@ function SourceEnv()
 if [ $# -gt 1 ]
 then
   HelpMsg
-  return
-elif [ $# -eq 1 ] && [ "$1" != "BaseTool" ]
+elif [ $# -eq 1 ] && [ "$1" != "BaseTools" ]
 then
   HelpMsg
-  return
+fi
+
+RETVAL=$?
+if [ $RETVAL -ne 0 ]
+then
+  return $RETVAL
 fi
 
 SourceEnv "$*"