setenv.c: further code shrink
setenv.c: further code shrink

    text           data     bss     dec     hex filename
-    672              0       4     676     2a4 libc/stdlib/setenv.o
+    546              0       4     550     226 libc/stdlib/setenv.o


joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc