vvfat: allow spaces in file names

In R/W mode, files with spaces were never created on host side.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1176
Fixes: c79e243ed6
Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221010175511.3414357-3-hpoussin@reactos.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/vvfat.c

@@ -499,7 +499,7 @@ static bool valid_filename(const unsigned char *name)
               (c >= 'A' && c <= 'Z') ||
               (c >= 'a' && c <= 'z') ||
               c > 127 ||
-              strchr("$%'-_@~`!(){}^#&.+,;=[]", c) != NULL))
+              strchr(" $%'-_@~`!(){}^#&.+,;=[]", c) != NULL))
         {
             return false;
         }