[PATCH] .travis.yml: Use travis_retry() in case of network issues

[Philippe Mathieu-Daudé]

Use travis_retry() when cloning SLOF (see 31c8cc4f94e) in the
s390x container job, to avoid build failures:

  $ ( cd ${SRC_DIR} ; git submodule update --init roms/SLOF )
  Submodule 'roms/SLOF' (https://git.qemu.org/git/SLOF.git) registered for path 
'roms/SLOF'
  Cloning into '/home/travis/build/user/qemu/roms/SLOF'...
  fatal: unable to access 'https://git.qemu.org/git/SLOF.git/': Could not 
resolve host: git.qemu.org
  fatal: clone of 'https://git.qemu.org/git/SLOF.git' into submodule path 
'/home/travis/build/user/qemu/roms/SLOF' failed
  Failed to clone 'roms/SLOF'. Retry scheduled
  Cloning into '/home/travis/build/user/qemu/roms/SLOF'...
  fatal: unable to access 'https://git.qemu.org/git/SLOF.git/': Could not 
resolve host: git.qemu.org
  fatal: clone of 'https://git.qemu.org/git/SLOF.git' into submodule path 
'/home/travis/build/user/qemu/roms/SLOF' failed
  Failed to clone 'roms/SLOF' a second time, aborting
  The command "( cd ${SRC_DIR} ; git submodule update --init roms/SLOF )" 
exited with 1.

Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index ec6367af1f..19a1b55aab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -496,7 +496,7 @@ jobs:
         - CONFIG="--disable-containers 
--target-list=${MAIN_SOFTMMU_TARGETS},s390x-linux-user"
         - UNRELIABLE=true
       script:
-        - ( cd ${SRC_DIR} ; git submodule update --init roms/SLOF )
+        - ( cd ${SRC_DIR} ; travis_retry git submodule update --init roms/SLOF 
)
         - BUILD_RC=0 && make -j${JOBS} || BUILD_RC=$?
         - |
           if [ "$BUILD_RC" -eq 0 ] ; then
-- 
2.21.3