Use unsigned int instead of int:
- modetest.c:89:1: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
- modetest.c:97:1: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
- modetest.c:117:1: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
- modetest.c:772:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

The 'fd' variable is global, we don't need to pass it as an argument:
- modetest.c:698:40: warning: unused parameter ‘fd’ [-Wunused-parameter]

We don't use the 'modeset' variable:
- modetest.c:725:8: warning: variable ‘modeset’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Paulo Zanoni <[email protected]>

Don't "continue" without freeing the connector.

192 bytes in 6 blocks are indirectly lost in loss record 6 of 12
   at 0x4C2779D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x4E30DD8: drmMalloc (xf86drm.c:147)
   by 0x4E35024: drmAllocCpy (xf86drmMode.c:73)
   by 0x4E35D69: drmModeGetConnector (xf86drmMode.c:507)
   by 0x402F22: dump_connectors (modetest.c:181)
   by 0x40261B: main (modetest.c:801)

Signed-off-by: Paulo Zanoni <[email protected]>

In the future we'll have more than just connector properties, so create
a dump_prop function that can handle any property (instead of the
current dump_props function that only handles connector properties).

Also, make this function print a lot more information about the existing
properties.

Also change the printed indentation of the modes to make the output more
readable.

The previous function dump_props also segfaulted when we didn't have
enought permissions. The new function does not segfault in this case (by
checking for the return value of drmModeGetProperty).

Signed-off-by: Paulo Zanoni <[email protected]>

New library calls:
- drmModeObjectGetProperties
- drmModeFreeObjectProperties
- drmModeObjectSetProperties

Signed-off-by: Paulo Zanoni <[email protected]>

Signed-off-by: Paulo Zanoni <[email protected]>

Signed-off-by: Vincent Stehlé <[email protected]>