Correct typos as per GH 20435

In GH 20435 many typos in our C code were corrected.  However, this pull
request was not applied to blead and developed merge conflicts.  I
extracted diffs for the individual modified files and applied them with
'git apply', excepting four files where patch conflicts were reported.
Those files were:

        handy.h
        locale.c
        regcomp.c
        toke.c

We can handle these in a subsequent commit. Also, had to run these two
programs to keep 'make test_porting' happy:

        $ ./perl -Ilib regen/uconfig_h.pl
        $ ./perl -Ilib regen/regcomp.pl regnodes.h

1 files changed, 3 insertions, 3 deletions

diff --git a/av.c b/av.c
index 058922de9d..ae902dd3ec 100644
--- a/av.c
+++ b/av.c
@@ -287,11 +287,11 @@ Perl_av_fetch(pTHX_ AV *av, SSize_t key, I32 lval)
     if ((Size_t)key >= (Size_t)size) {
         if (UNLIKELY(neg))
             return NULL;
-        goto emptyness;
+        goto emptiness;
     }
 
     if (!AvARRAY(av)[key]) {
-      emptyness:
+      emptiness:
         return lval ? av_store(av,key,newSV_type(SVt_NULL)) : NULL;
     }
 
@@ -655,7 +655,7 @@ void
 Perl_av_undef(pTHX_ AV *av)
 {
     bool real;
-    SSize_t orig_ix = PL_tmps_ix; /* silence bogus warning about possible unitialized use */
+    SSize_t orig_ix = PL_tmps_ix; /* silence bogus warning about possible uninitialized use */
 
     PERL_ARGS_ASSERT_AV_UNDEF;
     assert(SvTYPE(av) == SVt_PVAV);