branches: 1.3.16;
Look for the character to locate before checking for the NUL character

As documented in PR port-i386/49208, this fixes strchr(s, '\0'), as used by
the FAT first-stage bootloader on x86 (bootxx_msdos).
strchr(s, '\0') is otherwise equivalent to strlen(string), which would
probably look nicer in the original file, dosfs.c from libsa.

Confirmed working in qemu and on real hardware.
ok joerg@

XXX pull-up to netbsd-6 and netbsd-7

branches: 1.2.4;
For all i386 string assembly functions that don't overlap use END() so
that symbol size information is available.

branches: 1.1.2; 1.1.4; 1.1.8;
Add support for size optimised versions of the assembler functions in
the small subdirectory. Provide more compact versions of the functions
used by bootxx in x86.