_isc: use os->syscall_at instead of remove_if

shell/i.cpp

@@ -189,23 +189,26 @@ void _isc(Session &session, std::string vspace_name, bool sort,
         return;
     }
 
+    if(!addresses.empty()) {
+        for(uint32_t address: addresses) {
+            int syscall = os->find_syscall(address);
+            if(syscall == -1)
+                continue;
+
+            fmt::print(theme(3), "  0x{:08x}", address);
+            fmt::print(theme(10), "  %{:01x}", syscall);
+            fmt::print("\n");
+        }
+
+        return;
+    }
+
     int total = os->syscall_count();
     auto info = std::make_unique<SyscallInfo[]>(total);
 
     for(int i = 0; i < total; i++)
         info[i] = (SyscallInfo) {.address = os->syscall(i), .id = i};
 
-    if(!addresses.empty())
-        std::remove_if(&info[0], &info[total],
-            [addresses, &total](const SyscallInfo &item) {
-                if(std::find(addresses.begin(), addresses.end(), item.address)
-                    == addresses.end()) {
-                    total--;
-                    return true;
-                }
-                return false;
-            });
-
     if(sort)
         std::sort(&info[0], &info[total]);