misc: Fix coverity warning about indention

So we had one intended line inside the if for "SMS VALUE" and
at the same time one line with "SMS VALUE" at the same indention.
Assume it is copy and paste and remove the line. Currently we
are only parsing the ms_class so this change should not have any
semantic change.

Fixes: Coverity CID 1058761
diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp
index 4831c9e..133eb97 100644
--- a/src/gprs_bssgp_pcu.cpp
+++ b/src/gprs_bssgp_pcu.cpp
@@ -94,7 +94,6 @@
 		}
 		if (bitvec_read_field(block, rp, 1)) // SMS Present
 			bitvec_read_field(block, rp, 4); // SMS Value
-			bitvec_read_field(block, rp, 4); // SMS Value
 	}
 
 	bitvec_free(block);