Update libregexp with recent bug fixes from Plan 9.
diff --git a/src/libregexp/regsub.c b/src/libregexp/regsub.c
index 6de2c95..ab5ad99 100644
--- a/src/libregexp/regsub.c
+++ b/src/libregexp/regsub.c
@@ -53,9 +53,10 @@
 				     ssp < mp[0].e.ep; ssp++)
 					if(dp < ep)
 						*dp++ = *ssp;
-		}else
+		}else{
 			if(dp < ep)
 				*dp++ = *sp;
+		}
 		sp++;
 	}
 	*dp = '\0';