[patch] Remove redundant operation in pctr.c

[Nan Xiao]

Hi tech@,

Remove setting null-terminated string operation, since bzero()
has done this operation before. Sorry if I miss some points.

Thanks!

Best Regards
Nan Xiao

Index: pctr.c
===================================================================
RCS file: /cvs/src/usr.bin/pctr/pctr.c,v
retrieving revision 1.22
diff -u -p -r1.22 pctr.c
--- pctr.c      8 Feb 2015 23:40:34 -0000       1.22
+++ pctr.c      9 Sep 2017 03:43:36 -0000
@@ -169,7 +169,6 @@ pctr_cpu_creds(void)
        bzero(arch, sizeof(arch));
        if (sysctl(mib, 2, arch, &len, NULL, 0) == -1)
                err(1, "HW_MACHINE");
-       arch[len] = '\0';

        if (strcmp(arch, "i386") == 0)
                atype = ARCH_I386;
@@ -198,7 +197,6 @@ pctr_cpu_creds(void)
        bzero(vendor, sizeof(vendor));
        if (sysctl(mib, 2, vendor, &len, NULL, 0) == -1)
                err(1, "CPU_CPUVENDOR");
-       vendor[len] = '\0';

        switch (atype) {
        case ARCH_I386: