gnu: mailutils: Fix unitialized variable in readmsg.

Fixes <https://bugs.gnu.org/43088>.

* gnu/packages/patches/mailutils-fix-uninitialized-variable.patch: New
file.
* gnu/packages/mail.scm (mailutils)[source]: Add patch.
* gnu/local.mk (dist_patch_DATA): Register patch.

gnu/local.mk

@@ -1291,6 +1291,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/luajit-no_ldconfig.patch			\
   %D%/packages/patches/luit-posix.patch				\
   %D%/packages/patches/lvm2-static-link.patch			\
+  %D%/packages/patches/mailutils-fix-uninitialized-variable.patch	\
   %D%/packages/patches/make-impure-dirs.patch			\
   %D%/packages/patches/mariadb-client-test-32bit.patch		\
   %D%/packages/patches/mars-install.patch			\

gnu/packages/mail.scm

@@ -197,7 +197,10 @@ example, modify the message headers or body, or encrypt or sign the message.")
                                  version ".tar.xz"))
              (sha256
               (base32
-               "17smrxjdgbbzbzakik30vj46q4iib85ksqhb82jr4vjp57akszh9"))))
+               "17smrxjdgbbzbzakik30vj46q4iib85ksqhb82jr4vjp57akszh9"))
+             (patches
+              ;; Fixes https://issues.guix.gnu.org/43088.
+              (search-patches "mailutils-fix-uninitialized-variable.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:phases

gnu/packages/patches/mailutils-fix-uninitialized-variable.patch

@@ -0,0 +1,26 @@
+From 5ca6382fe8adb5bc436a6d873c8b86c69d5abfd1 Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Sun, 13 Sep 2020 14:43:46 +0300
+Subject: [PATCH] Fix uninitialized variable in readmsg
+
+* readmsg/readmsg.c (main): Initialize weedc.
+---
+ readmsg/readmsg.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/readmsg/readmsg.c b/readmsg/readmsg.c
+index 9f305bb9c..3a9f420db 100644
+--- a/readmsg/readmsg.c
++++ b/readmsg/readmsg.c
+@@ -466,7 +466,7 @@ main (int argc, char **argv)
+   mu_mailbox_t mbox = NULL;
+   struct mu_wordsplit ws;
+   char **weedv;
+-  int weedc;
++  int weedc = 0;
+   int unix_header = 0;
+   
+   /* Native Language Support */
+-- 
+2.28.0
+