[bug-patch] v2.6.1-165-gc43eeb2 regression

[Dmitry V. Levin]

Hi,

Starting with commit v2.6.1-165-gc43eeb2, output_file function is unable
to handle to == NULL, and GNU patch now segfaults on this test case:

$ echo data > target && patch -p1 << '__EOF__'
diff --git a/target b/target
index 1..0
__EOF__
patching file target
File target is not empty after patch, as expected
Segmentation fault


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