drm/i915/display/psr: Fix cppcheck warnings

Fix redundant condition, caught in cppcheck by kernel test robot.

Reported-by: kernel test robot <[e-mail]>
Cc: Gwan-gyeong Mun <[e-mail]>
Fixes: b64d6c51380b ("drm/i915/display: Support PSR Multiple Instances")
Signed-off-by: José Roberto de Souza <[e-mail]>
Reviewed-by: Harish Chegondi <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
(cherry picked from commit 1884b579c0cfbb52a92462184406558ac633cafb)
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/display/intel_psr.c

···
 		u32 psr_status;
 
 		mutex_lock(&intel_dp->psr.lock);
-		if (!intel_dp->psr.enabled ||
-		    (intel_dp->psr.enabled && intel_dp->psr.psr2_enabled)) {
+		if (!intel_dp->psr.enabled || intel_dp->psr.psr2_enabled) {
 			mutex_unlock(&intel_dp->psr.lock);
 			continue;
 		}