[PATCH v2 2/2] powerpc/sstep: Don’t define variables we won’t be using

When compiling with W=1 on 32-bit PowerPC, -Wunused-but-set-variable was
set, and alongside -Werror caused the build to fail with this error:
```
../arch/powerpc/lib/sstep.c: In function 'analyse_instr':
../arch/powerpc/lib/sstep.c:1350:28: error: variable 'suffix' set but not used [-Werror=unused-but-set-variable]
 1350 |         unsigned int word, suffix;
      |                            ^~~~~~
../arch/powerpc/lib/sstep.c:1346:38: error: variable 'rc' set but not used [-Werror=unused-but-set-variable]
 1346 |         unsigned int opcode, ra, rb, rc, rd, spr, u;
      |                                      ^~
cc1: all warnings being treated as errors
```

Signed-off-by: Link Mauve <[email protected]>
---
 arch/powerpc/lib/sstep.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index fd57b748cd2b..d49b2ef5d763 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1342,16 +1342,19 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 {
 #ifdef CONFIG_PPC64
 	unsigned int suffixopcode, prefixtype, prefix_r;
+	unsigned int rc, suffix;
 #endif
-	unsigned int opcode, ra, rb, rc, rd, spr, u;
+	unsigned int opcode, ra, rb, rd, spr, u;
 	unsigned long int imm;
 	unsigned long int val, val2;
 	unsigned int mb, me, sh;
-	unsigned int word, suffix;
+	unsigned int word;
 	long ival;
 
 	word = ppc_inst_val(instr);
+#ifdef CONFIG_PPC64
 	suffix = ppc_inst_suffix(instr);
+#endif
 
 	op->type = COMPUTE;
 
@@ -1469,7 +1472,9 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 	rd = (word >> 21) & 0x1f;
 	ra = (word >> 16) & 0x1f;
 	rb = (word >> 11) & 0x1f;
+#ifdef CONFIG_PPC64
 	rc = (word >> 6) & 0x1f;
+#endif
 
 	switch (opcode) {
 #ifdef CONFIG_PPC64
-- 
2.55.0