posix_fallocate.3: EBADF possible when lacking read access

posix_fallocate on a write-only FD may fail with a EBADF when fallocate(2) is unsupported by the filesystem and glibc must emulate it. The emulation requires read-write access to the file. The source code is in glibc's sysdeps/posix/posix_fallocate.c

Applies to git master.

index 6fae367..b92c140 100644
@@ -71,7 +71,8 @@ is not set.
 .TP
 .B EBADF
 .I fd
-is not a valid file descriptor, or is not opened for writing.
+is not a valid file descriptor, or is not opened for
+both reading and writing.
 .TP
 .B EFBIG
 .I offset+len

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