[PATCH] apply: Allow creating files with git patches

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In git 2.38.0 it is not possible to create a file with apply when the diff
looks like git diff.

It either complains that the source file is not /dev/null or that it is
not the same as the destination.

something.patch
No author found in something.patch
---
Sometext

Author: A. U. Thor <au@xxxxxxxx>
gitdiff_verify_name: line: b/somefile.c
@@ -0,0 +1,379 @@
+/*
...
, isnull: 0, *name: somefile.c, side: 1, another: (null)
error: git apply: bad git-diff - inconsistent new filename on line 80

something.patch
No author found in something.patch
---
Sometext

Author: A. U. Thor <au@xxxxxxxx>
gitdiff_verify_name: line: a/somefile.c
+++ b/somefile.c
@@ -0,0 +1,379 @@
+/*
...
, isnull: 1, *name: (null), side: 0
error: git apply: bad git-diff - expected /dev/null on line 80

Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
---
 apply.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apply.c b/apply.c
index 2b7cd930ef..9dd01da271 100644
--- a/apply.c
+++ b/apply.c
@@ -928,7 +928,7 @@ static int gitdiff_verify_name(struct gitdiff_data *state,
 			return error(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"),
 				     *name, state->linenr);
 		another = find_name(state->root, line, NULL, state->p_value, TERM_TAB);
-		if (!another || strcmp(another, *name)) {
+		if (another && strcmp(another, *name)) {
 			free(another);
 			return error((side == DIFF_NEW_NAME) ?
 			    _("git apply: bad git-diff - inconsistent new filename on line %d") :
-- 
2.38.0




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