Wrap the source code at 80 characters.

Align the backslashes in "exportname_config_help".

Tested with:

$ nbdkit null --filter=exportname --help

> [...]
> default-export=<NAME>     Canonical name for the "" default export.
> exportname-list=<MODE>    Which exports to advertise: keep (default),
>                           error, empty, defaultonly, explicit.
> exportname-strict=<BOOL>  Limit clients to explicit exports (default
>                           false).
> exportname=<NAME>         Add an explicit export name, may be
>                           repeated.
> exportdesc=<MODE>         Set descriptions according to mode: keep
>                           (default), none, fixed:STRING,
>                           script:SCRIPT.
> [...]

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2172516
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
 filters/exportname/exportname.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/filters/exportname/exportname.c b/filters/exportname/exportname.c
index 4949de398d66..7e0d4c171d25 100644
--- a/filters/exportname/exportname.c
+++ b/filters/exportname/exportname.c
@@ -141,14 +141,17 @@ exportname_config (nbdkit_next_config *next, 
nbdkit_backend *nxdata,
   return next (nxdata, key, value);
 }
 
-#define exportname_config_help \
+#define exportname_config_help                                              \
   "default-export=<NAME>     Canonical name for the \"\" default export.\n" \
-  "exportname-list=<MODE>    Which exports to advertise: keep (default), 
error,\n" \
-  "                          empty, defaultonly, explicit.\n" \
-  "exportname-strict=<BOOL>  Limit clients to explicit exports (default 
false).\n" \
-  "exportname=<NAME>         Add an explicit export name, may be repeated.\n" \
-  "exportdesc=<MODE>         Set descriptions according to mode: keep 
(default),\n" \
-  "                          none, fixed:STRING, script:SCRIPT.\n" \
+  "exportname-list=<MODE>    Which exports to advertise: keep (default),\n" \
+  "                          error, empty, defaultonly, explicit.\n"        \
+  "exportname-strict=<BOOL>  Limit clients to explicit exports (default\n"  \
+  "                          false).\n"                                     \
+  "exportname=<NAME>         Add an explicit export name, may be\n"         \
+  "                          repeated.\n"                                   \
+  "exportdesc=<MODE>         Set descriptions according to mode: keep\n"    \
+  "                          (default), none, fixed:STRING,\n"              \
+  "                          script:SCRIPT.\n"                              \
 
 static const char *
 get_desc (const char *name, const char *def)

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