Lintian tag information: source-field-malformed (type: error)

Description (from lintian-explain-tags)

In debian/control or a .dsc file, the Source field must contain only the
name of the source package. In a binary package, the Source field may also
optionally contain the version number of the corresponding source package
in parentheses.

Source package names must consist only of lowercase letters, digits, plus
and minus signs, and periods. They must be at least two characters long
and must start with an alphanumeric character.

Please refer to Source (Section 5.6.1) in the Debian Policy Manual for
details.

Visibility: error
Show-Always: no
Check: fields/source

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