Revert "More generalized fix for #127855"

This reverts commit bcc9f606509ad2fad50e16f081103451b7dc49e1.

This and the next commit revert the two commits that were an original fix
for RT #127855, but which is fixed in a different way in a following
commit.  See the ticket for more details.

1 files changed, 4 insertions, 7 deletions

diff --git a/sv.h b/sv.h
index 0c6e6d49b1..bfda6bf6cb 100644
--- a/sv.h
+++ b/sv.h
@@ -2111,15 +2111,12 @@ See also C<L</PL_sv_yes>> and C<L</PL_sv_no>>.
 
 #ifdef PERL_ANY_COW
 # define SvGROW(sv,len) \
-        (SvIsCOW(sv) || SvLEN(sv) < ((len)+2) ? sv_grow(sv,(len)+2) : SvPVX(sv))
-# define SvGROW_mutable(sv,len) \
-    (SvLEN(sv) < ((len)+2) ? sv_grow(sv,(len)+2) : SvPVX_mutable(sv))
+	(SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
 #else
-# define SvGROW(sv,len) \
-    (SvLEN(sv) < ((len)+1) ? sv_grow(sv,(len)+1) : SvPVX(sv))
-# define SvGROW_mutable(sv,len) \
-    (SvLEN(sv) < ((len)+1) ? sv_grow(sv,(len)+1) : SvPVX_mutable(sv))
+# define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
 #endif
+#define SvGROW_mutable(sv,len) \
+    (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
 #define Sv_Grow sv_grow
 
 #define CLONEf_COPY_STACKS 1