regexp.h: work around -Werror compile failure of XS in linux perf tool

The linux perf tool has an XS component, but when built using system
perl 5.14.0, its compilation errors out on the switch statement in
regexp.h: get_regex_charset_name(), which lacks a default case.  Add
one, copying the end-of-function return "?".

Preserve the end-of-function return "?", to avoid a hypothetical
compiler bug which misses the default case, and infers a void return
for a function thats declared otherwize.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/regexp.h b/regexp.h
index c4fa6090ed..5776a9023a 100644
--- a/regexp.h
+++ b/regexp.h
@@ -323,8 +323,9 @@ get_regex_charset_name(const U32 flags, STRLEN* const lenp)
 	case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
 	    *lenp = 2;
 	    return ASCII_MORE_RESTRICT_PAT_MODS;
+        default:
+	    return "?";	    /* Unknown */
     }
-
     return "?";	    /* Unknown */
 }