sysconf(): Fix line parser for /proc files.

Change-Id: I2678010ee95933de19c8a8e3b2fe65ceb9b86400

libc/docs/CHANGES.TXT

@@ -13,6 +13,9 @@ Differences between current and Android 2.2:
 - <sys/sysinfo.h>: Added missing sysinfo() system call implementation
   (the function was already declared in the header though).
 
+- sysconf() didn't work for some arguments due to a small bug in the
+  /proc line parser.
+
 -------------------------------------------------------------------------------
 Differences between Android 2.2. and Android 2.1:
 

libc/unistd/sysconf.c

@@ -317,7 +317,7 @@ line_parser_addc( LineParser*  p, int  c )
 static int
 line_parser_getc( LineParser*  p )
 {
-    if (p->in_len >= p->in_pos) {
+    if (p->in_pos >= p->in_len) {
         int  ret;
 
         p->in_len = p->in_pos = 0;