Add a patch to fix a compiler warning

genrand() returns an int. clang reports an error here.

genrand-return-value.patch

@@ -0,0 +1,12 @@
+diff -ruN scrub-2.5.2.orig/src/genrand.c scrub-2.5.2/src/genrand.c
+--- scrub-2.5.2.orig/src/genrand.c	2012-06-21 00:00:27.000000000 +0200
++++ scrub-2.5.2/src/genrand.c	2020-11-27 13:57:59.866410480 +0100
+@@ -106,7 +106,7 @@
+                 buf[n] = result;
+             }
+ #endif
+-            return;
++            return 0;
+         }
+     }
+ 

scrub.spec

@@ -6,6 +6,8 @@ License:	GPLv2+
 URL:		http://code.google.com/p/diskscrub/
 Source0:	http://diskscrub.googlecode.com/files/%{name}-%{version}.tar.bz2
 
+Patch0:		genrand-return-value.patch
+
 BuildRequires:  gcc
 %description
 Scrub writes patterns on files or disk devices to make
@@ -19,6 +21,8 @@ the file system is full, then scrubbed as in 2).
 %prep
 %setup -q
 
+%autopatch -p1
+
 %build
 %configure
 %{make_build}