env: fix check for sourcing vs running zephyr-env.sh

File name had wrong extension.

Change-Id: I9b8f57d21b2a497bf53e159a62dfee24a4c5de21
Reported-by: Rick Demers <richard.demers@windriver.com>
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
1 file changed