libcruft/sysconf_cpus.c patch

__sc_nr_cpus() [ == sysconf(_SC_NPROCESSORS_ONLN) ] can run off the end
of its /proc/cpuid buffer and (depending on process memory layout) dump
core.  This caused an intermittent dump in diet `x86info`.

This will still get a wrong answer if "processor" or one of the
other-arch strings happens to get cut by the buffer end.  Not important
for my application.  I would suggest a malloc'd buffer the full stat'd
size of /proc/cpuid, but that seems a bit scary with 160-core x86 boxes
running around out there this year...

>Bela<

--- libcruft/sysconf_cpus.c.orig	2007-08-24 14:19:33.000000000 -0700
+++ libcruft/sysconf_cpus.c	2010-11-22 18:46:44.831735537 -0800
@@ -50,7 +50,7 @@ int __sc_nr_cpus() {
 	  i+=9;
 	}
 #endif
-	while(buf[i++]!='\n');	/* skip rest of line */
+	while(i<n && buf[i++]!='\n');	/* skip rest of line */
       }
     }
     close(fd);