Fix Makefile so invalid characters warning preserves error code

Fix for commit e4c8865196f.

Reported-by: Peter Eisentraut

Discussion: 
https://postgr.es/m/88cb6ecf-22bb-431e-974b-1cd236a80...@eisentraut.org

Backpatch-through: master

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/498f130756914e1bc3125ddfc7e5c86f38ded8e8

Modified Files
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doc/src/sgml/Makefile | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

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