[misc 06/18] expressions: Make extract_min_valid() parameter const.

[Ben Pfaff]

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
---
 src/language/expressions/parse.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/language/expressions/parse.c b/src/language/expressions/parse.c
index ae968d0..b311c48 100644
--- 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
-- 
1.7.1