Fix memory leak in // caused by single-char character class

optimization. This was most probably introduced with #28262.
This change fixes perl #59516.

p4raw-id: //depot/perl@34507

1 files changed, 3 insertions, 0 deletions

diff --git a/regcomp.c b/regcomp.c
index 54347cca6e..68cc58cd02 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -8350,6 +8350,9 @@ parseit:
         *STRING(ret)= (char)value;
         STR_LEN(ret)= 1;
         RExC_emit += STR_SZ(1);
+	if (listsv) {
+	    SvREFCNT_dec(listsv);
+	}
         return ret;
     }
     /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */