Tests: Create a global scratch buffer and avoid allocating memory in the tests

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

test-tool/test_write12_beyond_eol.c

@@ -30,7 +30,6 @@ void
 test_write12_beyond_eol(void)
 { 
 	int i;
-	unsigned char *buf = alloca(256 * block_size);
 
 	CHECK_FOR_DATALOSS;
 
@@ -41,13 +40,13 @@ test_write12_beyond_eol(void)
 
 	logging(LOG_VERBOSE, LOG_BLANK_LINE);
 	logging(LOG_VERBOSE, "Test WRITE12 1-256 blocks one block beyond the end");
-	memset(buf, 0xa6, 256 * block_size);
+	memset(scratch, 0xa6, 256 * block_size);
 	for (i = 1; i <= 256; i++) {
 		if (maximum_transfer_length && maximum_transfer_length < i) {
 			break;
 		}
 		WRITE12(sd, num_blocks + 1 - i,
-                        i * block_size, block_size, 0, 0, 0, 0, 0, buf,
+                        i * block_size, block_size, 0, 0, 0, 0, 0, scratch,
                         EXPECT_LBA_OOB);
 	}
 
@@ -57,7 +56,7 @@ test_write12_beyond_eol(void)
 			break;
 		}
 		WRITE12(sd, 0x80000000,
-                        i * block_size, block_size, 0, 0, 0, 0, 0, buf,
+                        i * block_size, block_size, 0, 0, 0, 0, 0, scratch,
                         EXPECT_LBA_OOB);
 	}
 
@@ -67,7 +66,7 @@ test_write12_beyond_eol(void)
 			break;
 		}
 		WRITE12(sd, -1, i * block_size,
-                        block_size, 0, 0, 0, 0, 0, buf,
+                        block_size, 0, 0, 0, 0, 0, scratch,
                         EXPECT_LBA_OOB);
 	}
 
@@ -77,7 +76,7 @@ test_write12_beyond_eol(void)
 			break;
 		}
 		WRITE12(sd, num_blocks - 1,
-                        i * block_size, block_size, 0, 0, 0, 0, 0, buf,
+                        i * block_size, block_size, 0, 0, 0, 0, 0, scratch,
                         EXPECT_LBA_OOB);
 	}
 }