[Rpm-maint] [PATCH] fix %autopatch when patch do not exist

[Thierry Vignaud]

Hi

The attached patch fixes %autopatch (& thus %autosetup too) when a
patch doesn't actually exist.

Indeed, unlike Mageia's %apply_patches which inspired it, %autopatch
continues instead of exiting when it fails to apply a patch because it
doesn't exists. Eg:

+ /usr/bin/cat /home/tv/rpmbuild/SOURCES/test.patch2
+ /usr/bin/patch -p1 -s
/usr/bin/cat: /home/tv/rpmbuild/SOURCES/test.patch2: No such file or directory
+ /usr/bin/cat /home/tv/rpmbuild/SOURCES/test.patch
+ /usr/bin/patch -p1 -s

With the attached patch, the build stops as soon as the error is seen.

Please apply.
It should be backported to 4.12.x & 4.13.x branches too

See you
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