libc/sysdeps: dup3: fix typo in comment
libc/sysdeps: dup3: fix typo in comment

Signed-off-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@gentoo.org>

brgl/uclibc-ng,kraj/uClibc,ffainelli/uClibc,foss-xtensa/uClibc,brgl/uclibc-ng,wbx-github/uclibc-ng,hjl-tools/uClibc,kraj/uclibc-ng,groundwater/uClibc,hjl-tools/uClibc,hjl-tools/uClibc,kraj/uClibc,foss-xtensa/uClibc,majek/uclibc-vx32,groundwater/uClibc,foss-xtensa/uClibc,ddcc/klee-uclibc-0.9.33.2,foss-for-synopsys-dwc-arc-processors/uClibc,hwoarang/uClibc,mephi42/uClibc,ffainelli/uClibc,hwoarang/uClibc,groundwater/uClibc,kraj/uclibc-ng,mephi42/uClibc,mephi42/uClibc,kraj/uclibc-ng,waweber/uclibc-clang,hjl-tools/uClibc,foss-xtensa/uClibc,wbx-github/uclibc-ng,ffainelli/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,hjl-tools/uClibc,brgl/uclibc-ng,wbx-github/uclibc-ng,kraj/uClibc,ddcc/klee-uclibc-0.9.33.2,wbx-github/uclibc-ng,hwoarang/uClibc,majek/uclibc-vx32,brgl/uclibc-ng,kraj/uclibc-ng,majek/uclibc-vx32,waweber/uclibc-clang,groundwater/uClibc,hwoarang/uClibc,ddcc/klee-uclibc-0.9.33.2,majek/uclibc-vx32,ffainelli/uClibc,ffainelli/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,ddcc/klee-uclibc-0.9.33.2,groundwater/uClibc,waweber/uclibc-clang,waweber/uclibc-clang,mephi42/uClibc