Return void from gdb_putc

I don't think it's very useful to return the character from gdb_putc,
so this patch changes it to return void.

gdb/ui-file.c

@@ -60,12 +60,11 @@ ui_file::putstrn (const char *str, int n, int quoter, bool async_safe)
     printchar (str[i], quoter, async_safe);
 }
 
-int
+void
 ui_file::putc (int c)
 {
   char copy = (char) c;
   write (&copy, 1);
-  return c;
 }
 
 void

gdb/ui-file.h

@@ -51,7 +51,7 @@ public:
      write_async_safe method.  */
   void putstrn (const char *str, int n, int quoter, bool async_safe = false);
 
-  int putc (int c);
+  void putc (int c);
 
   void vprintf (const char *, va_list) ATTRIBUTE_PRINTF (2, 0);
 

gdb/utils.c

@@ -1838,16 +1838,13 @@ fputs_highlighted (const char *str, const compiled_regex &highlight,
     gdb_puts (str, stream);
 }
 
-/* Write character C to gdb_stdout using GDB's paging mechanism and return C.
-   May return nonlocally.  */
-
-int
+void
 gdb_putc (int c)
 {
   return gdb_stdout->putc (c);
 }
 
-int
+void
 gdb_putc (int c, struct ui_file *stream)
 {
   return stream->putc (c);

gdb/utils.h

@@ -224,9 +224,9 @@ extern void set_screen_width_and_height (int width, int height);
 
 extern void gdb_puts (const char *, struct ui_file *);
 
-extern int gdb_putc (int c, struct ui_file *);
+extern void gdb_putc (int c, struct ui_file *);
 
-extern int gdb_putc (int c);
+extern void gdb_putc (int c);
 
 extern void gdb_puts (const char *);