expressions: Make extract_min_valid() parameter const.

This fixes the following warning:

parse.c: In function ‘parse_function’:
parse.c:1213: warning: passing argument 1 of ‘extract_min_valid’ discards qualifiers from pointer target type

diff --git a/src/language/expressions/parse.c b/src/language/expressions/parse.c
index ae968d0078b5023f5647c1c600f1afcf0ea25b90..b311c4865a4e1e0c7788a0257a709af0ddc23835 100644 (file)
--- a/src/language/expressions/parse.c
+++ b/src/language/expressions/parse.c
@@ -1033,7 +1033,7 @@ lookup_function (const char *name,
 }
 
 static int
-extract_min_valid (char *s)
+extract_min_valid (const char *s)
 {
   char *p = strrchr (s, '.');
   if (p == NULL