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Remove obsolete 'fp' parameter to nextline

--- a/src/cmd/as/as.h

+++ b/src/cmd/as/as.h

@@ -163,7 +163,7 @@

 extern void error(char *msg, ...);

 /* Avoid errors in files where stdio is not included */

 #ifdef stdin

-extern int nextline(FILE *fp, struct line *linep);

+extern int nextline(struct line *linep);

 #endif

 extern void unexpected(void);

 extern void expect(int token);

--- a/src/cmd/as/main.c

+++ b/src/cmd/as/main.c

@@ -92,7 +92,6 @@

 dopass(char *fname)

 {

 	struct line line;

-	FILE *fp;

 	extern int nerrors;

 	extern jmp_buf recover;

@@ -101,7 +100,7 @@

 	endpass = 0;

 	setjmp(recover);

-	while (!endpass && nextline(fp, &line)) {

+	while (!endpass && nextline(&line)) {

 		linesym = NULL;

 		if (line.label)

--- a/src/cmd/as/parser.c

+++ b/src/cmd/as/parser.c

@@ -428,7 +428,7 @@

 }

 int

-nextline(FILE *fp, struct line *lp)

+nextline(struct line *lp)

 {

 	struct input *ip;

 	size_t n;