Fix warnings (some bugs, some spurious)

Many spurious VC warnings not quieted though.

lib/roken/getauxval.c

@@ -68,7 +68,7 @@ static void
 do_readprocauxv(void)
 {
     char *p = (void *)auxv;
-    ssize_t bytes;
+    ssize_t bytes = 0;
     size_t sz = sizeof(auxv) - sizeof(auxv[0]); /* leave terminator */
     int save_errno = errno;
     int fd;

lib/roken/getuserinfo.c

@@ -319,8 +319,8 @@ roken_get_loginname(char *user, size_t usersz)
     if (errno != ENOENT)
         return NULL;
 #endif
-#endif
 #endif
     errno = 0;
     return NULL;
+#endif
 }

lib/roken/roken.h.in

@@ -448,7 +448,7 @@ rk_wcsdup(const unsigned short *);
 
 #ifndef HAVE_MEMMEM
 #define memmem rk_smemmem
-ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL memmem(const char *);
+ROKEN_LIB_FUNCTION void * ROKEN_LIB_CALL memmem(const void *, size_t, const void *, size_t);
 #endif
 
 #ifdef HAVE_WINSOCK

lib/roken/sleep.c

@@ -41,7 +41,7 @@ ROKEN_LIB_FUNCTION unsigned int ROKEN_LIB_CALL
 sleep(unsigned int seconds)
 {
     if (SleepEx(1000 * (DWORD) seconds, FALSE) != 0)
-	return -1;
+	return 1; /* XXX Should get time before and after */
     return 0;
 }
 
@@ -50,6 +50,6 @@ ROKEN_LIB_FUNCTION unsigned int ROKEN_LIB_CALL
 usleep(unsigned int useconds)
 {
     if (SleepEx((DWORD)(useconds / 1000), FALSE) != 0)
-	return -1;
+	return 1000; /* XXX Should get time before and after */
     return 0;
 }