Remove an extra check for gang blocks in SNPRINTF_BLKPTR

This check, which compares the asizes of two different DVAs within the
same BP, was added by illumos-gate commit b24ab67[^1], and I can't
understand why.  It doesn't appear to do anything useful, so remove it.

[^1]: illumos/illumos-gate@b24ab67

Sponsored by:	ConnectWise
Signed-off-by:	Alan Somers<[email protected]>

Author: asomers

include/sys/spa.h

@@ -678,10 +678,6 @@ typedef struct blkptr {
 			    (u_longlong_t)BP_GET_IV2(bp),		\
 			    ws);					\
 		}							\
-		if (BP_IS_GANG(bp) &&					\
-		    DVA_GET_ASIZE(&bp->blk_dva[2]) <=			\
-		    DVA_GET_ASIZE(&bp->blk_dva[1]) / 2)			\
-			copies--;					\
 		len += func(buf + len, size - len,			\
 		    "[L%llu %s] %s %s %s %s %s %s %s%c"			\
 		    "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c"	\
@@ -694,8 +690,7 @@ typedef struct blkptr {
 		    BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE",		\
 		    BP_IS_GANG(bp) ? "gang" : "contiguous",		\
 		    BP_GET_DEDUP(bp) ? "dedup" : "unique",		\
-		    copies >= 0 && copies <= 3 ? copyname[copies] :	\
-			"invalid",					\
+		    copyname[copies],					\
 		    ws,							\
 		    (u_longlong_t)BP_GET_LSIZE(bp),			\
 		    (u_longlong_t)BP_GET_PSIZE(bp),			\