Don't make the extra check for errno == EINVAL MinGW specific.

This saves an #ifdef. There is precedent for an extra check without #ifdef
brackets already in refs.c (Solaris). The check for EINVAL shouldn't hurt.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>

write_or_die.c

@@ -34,16 +34,12 @@ void maybe_flush_or_die(FILE *f, const char *desc)
 			return;
 	}
 	if (fflush(f)) {
-#ifndef __MINGW32__
-		if (errno == EPIPE)
-#else
 		/*
 		 * On Windows, EPIPE is returned only by the first write()
 		 * after the reading end has closed its handle; subsequent
 		 * write()s return EINVAL.
 		 */
 		if (errno == EPIPE || errno == EINVAL)
-#endif
 			exit(0);
 		die("write failure on %s: %s", desc, strerror(errno));
 	}