fix mismatch of several esc seq. in one input

scroll does not detect two esc seq. with scroll up/down
command in the input buffer and handle it as regular input.
By using strncmp(3) with strlen(3) of the matching sequence,
we detect the fist command and irgnore the rest of the input
buffer.

scroll.c

@@ -493,7 +493,8 @@ main(int argc, char *argv[])
 				goto noevent;
 
 			for (size_t i = 0; i < LENGTH(rules); i++) {
-				if (strcmp(rules[i].seq, input) == 0) {
+				if (strncmp(rules[i].seq, input,
+				    strlen(rules[i].seq)) == 0) {
 					if (rules[i].event == SCROLL_UP)
 						scrollup(rules[i].lines);
 					if (rules[i].event == SCROLL_DOWN)