Fix a misleading indentation compiler warning

[kholia]

@magnumripper the following seems to be a valid warning, simply de-indenting the "if block" should get rid of this warning.

$ gcc --version
gcc (GCC) 6.1.1 20160621 (Red Hat 6.1.1-3)
Copyright (C) 2016 Free Software Foundation, Inc.

$ make
...
gcc ...options.c -o options.o
options.c: In function ‘opt_init’:
options.c:706:5: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
     if (!two_values)
     ^~
options.c:708:6: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’
      if (negative && options.loader.min_cost[i] == 0) {
      ^~

I don't actually know what this code does, so a careful review is needed.