When checking for old-style bash functions in the environment, check

When checking for old-style bash functions in the environment, check
for values starting with "() " (note the trailing space) rather
than "()".  Bash will only treat the value as a function if the
space after "()" is present.  The trailing space was already present
in the compare string but when it was added, the length passed to
strncmp() was not updated from 3 to 4.
Found by PVS-Studio.  No security impact.