kconfig: avoid multiple calls to strlen

Calls to strlen are costly, so avoid calling strln as much as we can.
Reported-by: NJean Delvare <jdelvare@suse.de>
Signed-off-by: N"Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Jean Delvare <jdelvare@suse.de>
Reviewed-by: NJean Delvare <jdelvare@suse.de>

scripts/kconfig/symbol.c

@@ -967,7 +967,7 @@ static int sym_rel_comp( const void *sym1, const void *sym2 )
 {
 	struct sym_match *s1 = *(struct sym_match **)sym1;
 	struct sym_match *s2 = *(struct sym_match **)sym2;
-	int l1, l2;
+	int exact1, exact2;
 
 	/* Exact match:
 	 * - if matched length on symbol s1 is the length of that symbol,
@@ -978,11 +978,11 @@ static int sym_rel_comp( const void *sym1, const void *sym2 )
 	 * exactly; if this is the case, we can't decide which comes first,
 	 * and we fallback to sorting alphabetically.
 	 */
-	l1 = s1->eo - s1->so;
-	l2 = s2->eo - s2->so;
-	if (l1 == strlen(s1->sym->name) && l2 != strlen(s2->sym->name))
+	exact1 = (s1->eo - s1->so) == strlen(s1->sym->name);
+	exact2 = (s2->eo - s2->so) == strlen(s2->sym->name);
+	if (exact1 && !exact2)
 		return -1;
-	if (l1 != strlen(s1->sym->name) && l2 == strlen(s2->sym->name))
+	if (!exact1 && exact2)
 		return 1;
 
 	/* As a fallback, sort symbols alphabetically */