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[as] Use isspace() in field()

We have verified the input string, so we can call isspace
without problems.

--- a/as/parser.c

+++ b/as/parser.c

@@ -296,7 +296,7 @@

 	if ((begin = *oldp) == NULL)

 		return NULL;

-	for (s = begin; *s == ' '; ++s)

+	for (s = begin; isspace(*s) && *s != '\t'; ++s)

 		;

 	if (*s == '\0' || *s == '/' || *s == ';') {

 		*t = '\0';

@@ -310,7 +310,7 @@

 	*siz -= begin - t;

 	*oldp = t;

-	while (t >= s && *t == ' ')

+	while (t >= s && isspace(*t))

 		*t-- = '\0';

 	return (*s != '\0') ? s : NULL;

 }