libbb: make trim() return pointer to terminating NUL

function                                             old     new   delta
trim                                                  80      90     +10
angle_address                                         56      50      -6
sysctl_main                                          282     273      -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/3 up/down: +10/-15)           Total:  -5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

miscutils/lsscsi.c

@@ -37,9 +37,8 @@ static char *get_line(const char *filename, char *buf, unsigned *bufsize_p)
 	if (sz < 0)
 		sz = 0;
 	buf[sz] = '\0';
-	trim(buf);
 
-	sz = strlen(buf) + 1;
+	sz = (trim(buf) - buf) + 1;
 	bufsize -= sz;
 	buf += sz;
 	buf[0] = '\0';