Unify programmer parameter extraction

Make programmer_param static by converting all users to extract_programmer_param.
Programmer parameters can no longer be separated with a
colon, they have to be separated with a comma.

Corresponding to flashrom svn r1072.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
diff --git a/flashrom.c b/flashrom.c
index db15ae5..fc78198 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -89,7 +89,7 @@
 ;
 #endif
 
-char *programmer_param = NULL;
+static char *programmer_param = NULL;
 
 /* Supported buses for the current programmer. */
 enum chipbustype buses_supported;
@@ -641,6 +641,11 @@
 	return opt;
 }
 
+char *extract_programmer_param(char *param_name)
+{
+	return extract_param(&programmer_param, param_name, ",");
+}
+
 /* start is an offset to the base address of the flash chip */
 int check_erased_range(struct flashchip *flash, int start, int len)
 {